feat: add keep alive

src-tauri/src/commands.rs

@@ -203,4 +203,33 @@ pub async fn set_channel_inverse_gain(
 
         Ok(r)
     })
-}
+}
+
+#[tauri::command]
+pub async fn recall_preset(
+    state: State<'_, AppState>,
+    id: u64,
+    preset_index: usize,
+) -> Result<bool, String> {
+    state.with_device_mut(id, |device| {
+        let success = device
+            .dsp
+            .recall_preset(preset_index)
+            .map_err(|e| e.to_string())?;
+
+        Ok(success)
+    })
+}
+
+#[tauri::command]
+pub async fn get_meter_levels(
+    state: State<'_, AppState>,
+    id: u64,
+) -> Result<dsp_thomann::dsp408::types::Meters, String> {
+    state.with_device_mut(id, |device| {
+        device
+            .dsp
+            .get_meter_levels()
+            .map_err(|e| e.to_string())
+    })
+}

src-tauri/src/lib.rs

@@ -16,7 +16,9 @@ pub fn run() {
                 commands::get_dsp_state,
                 commands::set_channel_gain,
                 commands::set_mute,
-                commands::set_channel_inverse_gain
+                commands::set_channel_inverse_gain,
+                commands::recall_preset,
+                commands::get_meter_levels,
             ]
         )
         .run(tauri::generate_context!())

src/App.tsx

@@ -8,9 +8,10 @@ import DSPPage from './pages/DspPage/DspPage';
 import AddDSPForm from './pages/AddDspPage/AddDspPage';
 import { useNotifications } from './hooks/useNotifications';
 import Notifications from './components/Notifications/Notifications';
-import { DSPState } from './types/dsp408State';
 import CreditsPage from './pages/CreditsPage/CreditsPage';
 import HomePage from './pages/HomePage/HomePage';
+import { getDSP408State, connectDSP408, disconnectDSP408 } from './api/dsp408';
+import { useDSPPolling } from './hooks/useDSPPolling';
 
 function App() {
   const [dsps, setDsps] = useState<DSP[]>([]);
@@ -18,7 +19,7 @@ function App() {
   const [page, setPage] = useState<AppPage>('home');
   const { notifications, notify, removeNotification, hoverNotification } = useNotifications();
 
-  async function addDSP(dsp: Omit<DSP, 'id' | 'status'>) {
+  async function addDSP(dsp: Omit<DSP, 'id' | 'status' | 'state' | 'meters'>) {
     try {
       const id = await invoke<number>('create_dsp408', {
         ip: dsp.ip,
@@ -30,6 +31,8 @@ function App() {
         id,
         ...dsp,
         status: 'disconnected',
+        state: null,
+        meters: null,
       };
 
       setDsps((prev) => [...prev, newDsp]);
@@ -69,17 +72,13 @@ function App() {
     setStatus(dsp.id, 'connecting');
 
     try {
-      await invoke('connect_dsp408', {
+      await connectDSP408(dsp.id);
-        id: dsp.id,
-      });
-
-      console.log('Connected');
 
       setStatus(dsp.id, 'connected');
 
-      const state = await getDSPState(dsp);
+      const state = await getDSP408State(dsp.id);
 
-      console.log(state);
+      setDsps((prev) => prev.map((d) => (d.id === dsp.id ? { ...d, state } : d)));
 
       notify('Connected', 'success', dsp.name);
     } catch (err) {
@@ -91,9 +90,7 @@ function App() {
 
   async function disconnectDSP(dsp: DSP) {
     try {
-      await invoke('disconnect_dsp408', {
+      await disconnectDSP408(dsp.id);
-        id: dsp.id,
-      });
 
       setStatus(dsp.id, 'disconnected');
 
@@ -103,26 +100,13 @@ function App() {
     }
   }
 
-  async function getDSPState(dsp: DSP) {
-    try {
-      const state = await invoke<DSPState>('get_dsp_state', {
-        id: dsp.id,
-      });
-
-      return state;
-    } catch (err) {
-      notify(`Failed to get state: ${String(err)}`, 'error', dsp.name);
-
-      return null;
-    }
-  }
-
   function setStatus(id: number, status: DSPStatus) {
     setDsps((prev) => prev.map((d) => (d.id === id ? { ...d, status } : d)));
   }
 
   const activeDsp = dsps.find((d) => d.id === selected) ?? null;
   const connectedDspCount = dsps.filter((dsp) => dsp.status === 'connected').length;
+  useDSPPolling(dsps, selected, setDsps);
 
   return (
     <div className="app">

src/api/dsp408.ts

@@ -0,0 +1,25 @@
+import { invoke } from '@tauri-apps/api/core';
+import { DSPState, Meters } from '../types/dsp408State';
+
+export const createDSP408 = (ip: string, port: number, deviceId: number) =>
+  invoke<number>('create_dsp408', {
+    ip,
+    port,
+    deviceId,
+  });
+
+export const removeDSP408 = (id: number) => invoke('remove_dsp408', { id });
+
+export const connectDSP408 = (id: number) => invoke('connect_dsp408', { id });
+
+export const disconnectDSP408 = (id: number) => invoke('disconnect_dsp408', { id });
+
+export const getDSP408State = (id: number) => invoke<DSPState>('get_dsp_state', { id });
+
+export const recallPreset = (id: number, presetIndex: number) =>
+  invoke<boolean>('recall_preset', {
+    id,
+    presetIndex,
+  });
+
+export const getDSP408MeterLevels = (id: number) => invoke<Meters>('get_meter_levels', { id });

src/components/Sidebar/Sidebar.css

@@ -264,3 +264,132 @@
 .app-root--sidebar-expanded .stage--with-sidebar {
   margin-left: var(--sidebar-width-expanded);
 }
+
+.sidebar-app-combobox {
+  position: relative;
+  flex: 1 1 auto;
+  min-width: 0;
+
+  opacity: 0;
+  max-width: 0;
+  pointer-events: none;
+
+  transition:
+    opacity var(--dur-fast) var(--ease-standard),
+    max-width var(--dur-base) var(--ease-standard);
+}
+
+.sidebar-rail--expanded .sidebar-app-combobox {
+  opacity: 1;
+  max-width: 200px;
+  pointer-events: auto;
+  transition-delay: var(--dur-fast);
+}
+
+.sidebar-app-trigger {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-2);
+
+  height: calc(var(--header-height) * 0.6);
+  padding: 0 var(--space-2);
+
+  background: var(--bg-panel);
+  border: var(--border-width) solid var(--border-hairline);
+  border-radius: var(--radius-sm);
+
+  color: var(--text-primary);
+  font-family: var(--font-ui);
+  font-size: var(--font-xs);
+  font-weight: var(--font-weight-semibold);
+
+  cursor: pointer;
+  transition: border-color var(--dur-base) var(--ease-standard);
+}
+
+.sidebar-app-trigger:hover,
+.sidebar-app-trigger--open {
+  border-color: var(--accent-brand);
+}
+
+.sidebar-app-trigger-label {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.sidebar-app-trigger-caret {
+  flex-shrink: 0;
+  color: var(--text-muted);
+  transition: transform var(--dur-base) var(--ease-standard);
+}
+
+.sidebar-app-trigger--open .sidebar-app-trigger-caret {
+  transform: rotate(180deg);
+}
+
+.sidebar-app-input {
+  width: 100%;
+  height: calc(var(--header-height) * 0.6);
+  padding: 0 var(--space-2);
+
+  background: var(--bg-panel);
+  border: var(--border-width) solid var(--accent-brand);
+  border-radius: var(--radius-sm);
+
+  color: var(--text-primary);
+  font-family: var(--font-ui);
+  font-size: var(--font-xs);
+  font-weight: var(--font-weight-semibold);
+
+  outline: none;
+}
+
+.sidebar-app-listbox {
+  position: absolute;
+  top: calc(100% + var(--space-1));
+  left: 0;
+  right: 0;
+  z-index: 40;
+
+  margin: 0;
+  padding: var(--space-1);
+  list-style: none;
+
+  background: var(--bg-panel);
+  border: var(--border-width) solid var(--border-hairline);
+  border-radius: var(--radius-sm);
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
+
+  max-height: 240px;
+  overflow-y: auto;
+}
+
+.sidebar-app-option {
+  padding: var(--space-2);
+  border-radius: var(--radius-sm);
+  font-size: var(--font-xs);
+  color: var(--text-primary);
+  cursor: pointer;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.sidebar-app-option--highlight {
+  background: var(--bg-raised);
+}
+
+.sidebar-app-option--selected {
+  color: var(--accent-brand);
+  font-weight: var(--font-weight-semibold);
+}
+.sidebar-rail--expanded .sidebar-app-select {
+  opacity: 1;
+  max-width: 200px;
+  padding-inline: var(--space-2);
+  pointer-events: auto;
+  transition-delay: var(--dur-fast);
+}

src/components/Sidebar/Sidebar.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import './Sidebar.css';
 import { ChevronLeftIcon } from '../../assets/icons/ChevronLeftIcon';
 
@@ -8,6 +8,11 @@ export type SidebarItem = {
   icon: React.ReactNode;
 };
 
+export type SidebarAppOption = {
+  id: string;
+  name: string;
+};
+
 function SidebarButton({
   item,
   active,
@@ -31,11 +36,178 @@ function SidebarButton({
   );
 }
 
+function AppCombobox({
+  appOptions,
+  selectedAppId,
+  appName,
+  onAppChange,
+  onAppRename,
+}: {
+  appOptions: SidebarAppOption[];
+  selectedAppId?: string;
+  appName: string;
+  onAppChange?: (id: string) => void;
+  onAppRename?: (name: string) => void;
+}) {
+  const currentOption = appOptions.find((o) => o.id === selectedAppId) ?? appOptions[0];
+
+  const [open, setOpen] = useState(false);
+  const [editing, setEditing] = useState(false);
+  const [inputValue, setInputValue] = useState(currentOption?.name ?? appName);
+  const [highlight, setHighlight] = useState(0);
+
+  const rootRef = useRef<HTMLDivElement>(null);
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (!editing) setInputValue(currentOption?.name ?? appName);
+  }, [currentOption?.id, currentOption?.name, appName, editing]);
+
+  // Close on outside click
+  useEffect(() => {
+    function handleClick(e: MouseEvent) {
+      if (rootRef.current && !rootRef.current.contains(e.target as Node)) {
+        setOpen(false);
+        if (editing) commitRename();
+      }
+    }
+    document.addEventListener('mousedown', handleClick);
+    return () => document.removeEventListener('mousedown', handleClick);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [editing, inputValue]);
+
+  function openList() {
+    setOpen(true);
+    const idx = appOptions.findIndex((o) => o.id === currentOption?.id);
+    setHighlight(idx >= 0 ? idx : 0);
+  }
+
+  function pick(opt: SidebarAppOption) {
+    if (opt.id !== selectedAppId) onAppChange?.(opt.id);
+    setInputValue(opt.name);
+    setOpen(false);
+    setEditing(false);
+  }
+
+  function startEditing(e: React.MouseEvent) {
+    e.stopPropagation();
+    setEditing(true);
+    setOpen(false);
+    requestAnimationFrame(() => {
+      inputRef.current?.focus();
+      inputRef.current?.select();
+    });
+  }
+
+  function commitRename() {
+    const trimmed = inputValue.trim();
+    setEditing(false);
+    if (!trimmed) {
+      setInputValue(currentOption?.name ?? appName);
+      return;
+    }
+    const matched = appOptions.find((o) => o.name === trimmed);
+    if (matched) {
+      if (matched.id !== selectedAppId) onAppChange?.(matched.id);
+      return;
+    }
+    if (trimmed !== currentOption?.name) {
+      onAppRename?.(trimmed);
+    }
+  }
+
+  function handleKeyDown(e: React.KeyboardEvent) {
+    if (editing) {
+      if (e.key === 'Enter') inputRef.current?.blur();
+      if (e.key === 'Escape') {
+        setInputValue(currentOption?.name ?? appName);
+        setEditing(false);
+      }
+      return;
+    }
+    if (!open) {
+      if (e.key === 'Enter' || e.key === ' ' || e.key === 'ArrowDown') {
+        e.preventDefault();
+        openList();
+      }
+      return;
+    }
+    if (e.key === 'ArrowDown') {
+      e.preventDefault();
+      setHighlight((h) => Math.min(h + 1, appOptions.length - 1));
+    } else if (e.key === 'ArrowUp') {
+      e.preventDefault();
+      setHighlight((h) => Math.max(h - 1, 0));
+    } else if (e.key === 'Enter') {
+      e.preventDefault();
+      pick(appOptions[highlight]);
+    } else if (e.key === 'Escape') {
+      setOpen(false);
+    }
+  }
+
+  return (
+    <div className="sidebar-app-combobox" ref={rootRef}>
+      {editing ? (
+        <input
+          ref={inputRef}
+          className="sidebar-app-input"
+          value={inputValue}
+          onChange={(e) => setInputValue(e.target.value)}
+          onBlur={commitRename}
+          onKeyDown={handleKeyDown}
+          aria-label="Rename app"
+        />
+      ) : (
+        <button
+          type="button"
+          className={'sidebar-app-trigger' + (open ? ' sidebar-app-trigger--open' : '')}
+          onClick={() => (open ? setOpen(false) : openList())}
+          onDoubleClick={startEditing}
+          onKeyDown={handleKeyDown}
+          aria-haspopup="listbox"
+          aria-expanded={open}
+        >
+          <span className="sidebar-app-trigger-label">{currentOption?.name ?? appName}</span>
+          <svg className="sidebar-app-trigger-caret" viewBox="0 0 24 24" width="14" height="14">
+            <path d="M6 9l6 6 6-6" stroke="currentColor" strokeWidth="2" fill="none" />
+          </svg>
+        </button>
+      )}
+
+      {open && (
+        <ul className="sidebar-app-listbox" role="listbox">
+          {appOptions.map((opt, i) => (
+            <li
+              key={opt.id}
+              role="option"
+              aria-selected={opt.id === selectedAppId}
+              className={
+                'sidebar-app-option' +
+                (opt.id === selectedAppId ? ' sidebar-app-option--selected' : '') +
+                (i === highlight ? ' sidebar-app-option--highlight' : '')
+              }
+              onMouseEnter={() => setHighlight(i)}
+              onClick={() => pick(opt)}
+            >
+              {opt.name}
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+}
+
 export default function Sidebar({
   items,
   activeId,
   onSelect,
   appName,
+  appOptions,
+  selectedAppId,
+  onAppChange,
+  onAppRename,
   expanded,
   onToggle,
 }: {
@@ -43,10 +215,15 @@ export default function Sidebar({
   activeId: string | null;
   onSelect: (id: string) => void;
   appName: string;
+  appOptions?: SidebarAppOption[];
+  selectedAppId?: string;
+  onAppChange?: (id: string) => void;
+  onAppRename?: (name: string) => void;
   expanded: boolean;
   onToggle: () => void;
 }) {
   const scrollRef = useRef<HTMLDivElement>(null);
+  const hasOptions = appOptions && appOptions.length > 0;
 
   const updateFade = () => {
     const el = scrollRef.current;
@@ -71,7 +248,17 @@ export default function Sidebar({
   return (
     <nav className={'sidebar-rail' + (expanded ? ' sidebar-rail--expanded' : '')}>
       <div className="sidebar-header">
-        <span className="sidebar-app-name">{appName}</span>
+        {hasOptions ? (
+          <AppCombobox
+            appOptions={appOptions!}
+            selectedAppId={selectedAppId}
+            appName={appName}
+            onAppChange={onAppChange}
+            onAppRename={onAppRename}
+          />
+        ) : (
+          <span className="sidebar-app-name">{appName}</span>
+        )}
         <button
           className="sidebar-toggle"
           onClick={onToggle}

src/components/dsp408/ChannelGroup/ChannelGroup.css

@@ -39,5 +39,5 @@
   flex-direction: row;
   align-items: stretch;
   height: 100%;
-  gap: var(--space-4);
+  gap: var(--space-2);
 }

src/components/dsp408/GainSection/GainSection.css

@@ -1,11 +1,10 @@
 .gain-section {
-  position: absolute; /* was: fixed — now relative to .dsp-content, which is the fixed+inset parent */
+  position: absolute;
-  left: 0; /* was: var(--sidebar-width-collapsed) — .dsp-content already excludes the sidebar */
+  left: 0;
   right: 0;
   bottom: 0;
 
-  height: var(--gain-section-height);
+  height: var(--dsp-control-heigth);
-  min-height: 0;
 
   display: flex;
   align-items: flex-end;
@@ -18,65 +17,77 @@
 
   z-index: 20;
 
-  border-top: 1px solid var(--border-hairline);
+  border-top: var(--border-width) solid var(--border-hairline);
 }
 
 .gain-panels {
-  display: flex;
-  flex-direction: row;
-  align-items: stretch;
-  justify-content: safe center; /* centers when it fits, falls back to start-aligned scroll when it overflows */
-  gap: var(--space-4);
-  width: 100%;
   height: 100%;
-  min-width: 0;
+  display: flex;
-  min-height: 0;
+  gap: var(--space-4);
   overflow-x: auto;
-  overflow-y: hidden;
 }
 
 .gain-panel-frame {
   flex: 0 0 auto;
-  height: calc(100% - 8px);
+  height: calc(100% - 2 * var(--space-1));
-  aspect-ratio: var(--panel-w) / var(--panel-h); /* now driven by JS, not duplicated */
+  margin: var(--space-1) 0;
-  margin: 4px 0;
+}
+
+.gain-panel-viewport {
+  position: relative;
+  aspect-ratio: 90 / 400;
+  overflow: hidden;
   box-sizing: border-box;
 }
 
-.gain-panels::-webkit-scrollbar {
-  height: 6px;
-}
-.gain-panels::-webkit-scrollbar-thumb {
-  background: var(--border-hairline);
-  border-radius: var(--radius-pill);
-}
-.gain-panels::-webkit-scrollbar-track {
-  background: transparent;
-}
-
 .gain-panel {
-  /* width/height now set inline from DESIGN_WIDTH/HEIGHT, drop the fixed px here */
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform-origin: center center;
+
   display: flex;
   flex-direction: column;
   align-items: center;
   justify-content: flex-start;
-  border: 1px solid var(--border-hairline);
+
+  border: var(--border-width) solid var(--border-hairline);
   border-radius: var(--radius-md);
   box-sizing: border-box;
-  padding: 8px;
+  gap: var(--space-2);
   background: var(--bg-void);
 }
 
 .gain-panel__title {
+  flex: 0 0 auto; /* NEW: never let this shrink */
   width: 100%;
-
   text-align: center;
-
   font-family: var(--font-ui);
-  font-size: 12px;
+  font-size: var(--font-sm);
   font-weight: var(--font-weight-semibold);
-
+  padding-top: var(--space-2);
-  padding-bottom: 6px;
+  padding-bottom: var(--space-2);
-
+  border-bottom: var(--border-width) solid var(--border-hairline);
-  border-bottom: 1px solid var(--border-hairline);
+}
+
+.channel-group__label {
+  font-size: calc(var(--tab-close-font) * var(--panel-scale, 1));
+}
+
+/* --- graph strip, sits above the gain section ---
+   Requires the shared parent (whatever renders <GainSection />) to be
+   position: relative — it already must be, for .gain-section's absolute
+   bottom:0 to anchor correctly. */
+.linear-graph-section {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: var(--dsp-control-heigth);
+
+  box-sizing: border-box;
+  padding: var(--space-4);
+
+  background: var(--bg-panel);
+  z-index: 10; /* stays below .gain-section's z-index: 20 */
 }

src/components/dsp408/GainSection/GainSection.tsx

@@ -3,13 +3,37 @@ import { invoke } from '@tauri-apps/api/core';
 import { InputChannel, Channel, OutputChannel } from '../../../types/dsp408State';
 import { DSP } from '../../../types/types';
 import { NotificationType } from '../../../types/types';
-import { useState } from 'react';
 import Button from '../../Button/Button';
 import ChannelGroup from '../ChannelGroup/ChannelGroup';
+import { LinearGraph } from '../LinearGraph/LinearGraph';
+import { useEffect, useRef, useState } from 'react';
 import './GainSection.css';
 
-const DESIGN_WIDTH = 90;
+const PANEL_DESIGN_WIDTH = 90;
-const DESIGN_HEIGHT = 380;
+const PANEL_DESIGN_HEIGHT = 400;
+
+function ChannelGroupScaled({ title, children }: { title: string; children: React.ReactNode }) {
+  const wrapperRef = useRef<HTMLDivElement>(null);
+  const [scale, setScale] = useState(1);
+
+  useEffect(() => {
+    const el = wrapperRef.current;
+    if (!el) return;
+    const observer = new ResizeObserver((entries) => {
+      const { height } = entries[0].contentRect;
+      if (height === 0) return;
+      setScale(height / PANEL_DESIGN_HEIGHT); // height is the only free axis here
+    });
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, []);
+
+  return (
+    <div ref={wrapperRef} style={{ height: '100%', '--panel-scale': scale } as React.CSSProperties}>
+      <ChannelGroup title={title}>{children}</ChannelGroup>
+    </div>
+  );
+}
 
 function GainPanel({
   dsp,
@@ -78,6 +102,8 @@ function GainPanel({
 
   const [muted, setMuted] = useState(false);
   const [inverted, setInverted] = useState(false);
+  const viewportRef = useRef<HTMLDivElement>(null);
+  const [scale, setScale] = useState(1);
 
   const toggleMute = async () => {
     const next = !muted;
@@ -91,9 +117,28 @@ function GainPanel({
     await setInverse(next);
   };
 
+  useEffect(() => {
+    const el = viewportRef.current;
+    if (!el) return;
+    const observer = new ResizeObserver((entries) => {
+      const { width, height } = entries[0].contentRect;
+      if (width === 0 || height === 0) return;
+      setScale(Math.min(width / PANEL_DESIGN_WIDTH, height / PANEL_DESIGN_HEIGHT));
+    });
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, []);
+
   return (
-    <div className="gain-panel-frame">
+    <div className="gain-panel-viewport" ref={viewportRef}>
-      <div className="gain-panel" style={{ width: DESIGN_WIDTH, height: DESIGN_HEIGHT }}>
+      <div
+        className="gain-panel"
+        style={{
+          width: PANEL_DESIGN_WIDTH,
+          height: PANEL_DESIGN_HEIGHT,
+          transform: `translate(-50%, -50%) scale(${scale})`,
+        }}
+      >
         <div className="gain-panel__title">{title}</div>
 
         <VerticalSlider
@@ -104,12 +149,12 @@ function GainPanel({
           switchStep={0.1}
           unit=" dB"
           onChange={setGain}
+          style={{ width: 70, height: 260, flex: '0 0 auto' }} // pin to design size, disable its own auto-shrink
         />
 
         <Button variant="toggle" className={muted ? 'active-danger' : ''} onClick={toggleMute}>
           {muted ? 'Muted' : 'Mute'}
         </Button>
-
         <Button
           variant="toggle"
           className={inverted ? 'active-warning' : ''}
@@ -148,21 +193,48 @@ function GainSection({
   ];
 
   return (
-    <div className="gain-section">
+    <>
-      <div className="gain-panels">
+      <div className="linear-graph-section">
-        <ChannelGroup title="Input">
+        <LinearGraph
-          {inputs.map(({ channel, title }) => (
+          xMin={20}
-            <GainPanel key={title} dsp={dsp} notify={notify} channel={channel} title={title} />
+          xMax={20000}
-          ))}
+          yMin={-24}
-        </ChannelGroup>
+          yMax={24}
-
+          yStep={6}
-        <ChannelGroup title="Output">
+          xLabel="Hz"
-          {outputs.map(({ channel, title }) => (
+          yLabel="dB"
-            <GainPanel key={title} dsp={dsp} notify={notify} channel={channel} title={title} />
+          draw={({ ctx, toPx }) => {
-          ))}
+            // placeholder flat 0 dB response — swap for real EQ/filter data.
-        </ChannelGroup>
+            // NOTE: this maps x linearly; for a real frequency response you'll
+            // likely want a log-frequency x-axis instead (see chat notes).
+            ctx.strokeStyle = '#4ade80';
+            ctx.lineWidth = 2;
+            const [x0, y0] = toPx(20, 0);
+            const [x1, y1] = toPx(20000, 0);
+            ctx.beginPath();
+            ctx.moveTo(x0, y0);
+            ctx.lineTo(x1, y1);
+            ctx.stroke();
+          }}
+        />
       </div>
-    </div>
+
+      <div className="gain-section">
+        <div className="gain-panels">
+          <ChannelGroup title="Input">
+            {inputs.map(({ channel, title }) => (
+              <GainPanel key={title} dsp={dsp} notify={notify} channel={channel} title={title} />
+            ))}
+          </ChannelGroup>
+
+          <ChannelGroup title="Output">
+            {outputs.map(({ channel, title }) => (
+              <GainPanel key={title} dsp={dsp} notify={notify} channel={channel} title={title} />
+            ))}
+          </ChannelGroup>
+        </div>
+      </div>
+    </>
   );
 }
 

src/components/dsp408/GateSection/GateSection.css

@@ -1,118 +1,4 @@
-.gate-section {
+.rerere {
-  position: absolute;
-  left: 0;
-  right: 0;
-  bottom: 0;
-
-  height: var(--gain-section-height);
-  min-height: 0;
-
-  display: flex;
-  align-items: flex-end;
-  justify-content: center;
-
-  box-sizing: border-box;
-  padding: 0 var(--space-4);
-
-  background: var(--bg-panel);
-
-  z-index: 20;
-
-  border-top: 1px solid var(--border-hairline);
-}
-
-.gate-panels {
-  display: flex;
-  flex-direction: row;
-  align-items: stretch;
-  justify-content: safe center;
-  gap: var(--space-4);
-  width: 100%;
   height: 100%;
-  min-width: 0;
+  width: 10%;
-  min-height: 0;
-  overflow-x: auto;
-  overflow-y: hidden;
-}
-
-.gate-panel-frame {
-  flex: 0 0 auto;
-  height: calc(100% - 8px);
-  aspect-ratio: var(--panel-w) / var(--panel-h);
-  margin: 4px 0;
-  box-sizing: border-box;
-}
-
-.gate-panels::-webkit-scrollbar {
-  height: 6px;
-}
-.gate-panels::-webkit-scrollbar-thumb {
-  background: var(--border-hairline);
-  border-radius: var(--radius-pill);
-}
-.gate-panels::-webkit-scrollbar-track {
-  background: transparent;
-}
-
-.gate-panel {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: flex-start;
-  border: 1px solid var(--border-hairline);
-  border-radius: var(--radius-md);
-  box-sizing: border-box;
-  padding: 8px;
-  background: var(--bg-void);
-}
-
-.gate-panel__title {
-  width: 100%;
-
-  text-align: center;
-
-  font-family: var(--font-ui);
-  font-size: 12px;
-  font-weight: var(--font-weight-semibold);
-
-  padding-bottom: 6px;
-
-  border-bottom: 1px solid var(--border-hairline);
-}
-
-.gate-panel__sliders {
-  display: flex;
-  flex-direction: row;
-  align-items: stretch;
-  justify-content: center;
-  gap: var(--space-2);
-  width: 100%;
-  flex: 1;
-  min-height: 0;
-}
-
-.gate-panel__slider-col {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  flex: 1 1 0;
-  min-width: 0;
-}
-
-.gate-panel__slider-label {
-  font-family: var(--font-ui);
-  font-size: 10px;
-  font-weight: var(--font-weight-medium);
-  text-align: center;
-  padding-top: 4px;
-  color: var(--text-secondary);
-}
-
-/* GateSection.css */
-.gate-panels .channel-group__items {
-  display: grid;
-  grid-template-columns: repeat(2, auto);
-  grid-template-rows: repeat(2, 1fr);
-  gap: var(--space-2);
-  align-items: stretch;
 }

src/components/dsp408/GateSection/GateSection.tsx

@@ -0,0 +1,35 @@
+import VerticalSlider from '../Slider/VerticalSlider';
+import { invoke } from '@tauri-apps/api/core';
+import { InputChannel, Channel, OutputChannel } from '../../../types/dsp408State';
+import { DSP } from '../../../types/types';
+import { NotificationType } from '../../../types/types';
+
+import ChannelGroup from '../ChannelGroup/ChannelGroup';
+import './GateSection.css';
+
+function GateSection({
+  dsp,
+  notify,
+}: {
+  dsp: DSP;
+  notify: (message: string, type?: NotificationType, dspName?: string) => void;
+}) {
+  console.log(dsp, notify);
+  return (
+    <div className="rerere">
+      <VerticalSlider
+        min={-60}
+        max={12}
+        step={0.5}
+        switchStepValue={-10}
+        switchStep={0.1}
+        unit=" dB"
+        onChange={(_f: number) => {
+          return;
+        }}
+      />
+    </div>
+  );
+}
+
+export default GateSection;

src/components/dsp408/LinearGraph/LinearGraph.css

@@ -0,0 +1,93 @@
+.gain-section {
+  position: absolute;
+  left: 0;
+  right: 0;
+  bottom: 0;
+
+  height: var(--dsp-control-heigth);
+
+  display: flex;
+  align-items: flex-end;
+  justify-content: center;
+
+  box-sizing: border-box;
+  padding: 0 var(--space-4);
+
+  background: var(--bg-panel);
+
+  z-index: 20;
+
+  border-top: var(--border-width) solid var(--border-hairline);
+}
+
+.gain-panels {
+  height: 100%;
+  display: flex;
+  gap: var(--space-4);
+  overflow-x: auto;
+}
+
+.gain-panel-frame {
+  flex: 0 0 auto;
+  height: calc(100% - 2 * var(--space-1));
+  margin: var(--space-1) 0;
+}
+
+.gain-panel-viewport {
+  position: relative;
+  aspect-ratio: 90 / 400;
+  overflow: hidden;
+  box-sizing: border-box;
+}
+
+.gain-panel {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform-origin: center center;
+
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: flex-start;
+
+  border: var(--border-width) solid var(--border-hairline);
+  border-radius: var(--radius-md);
+  box-sizing: border-box;
+  gap: var(--space-2);
+  background: var(--bg-void);
+}
+
+.gain-panel__title {
+  flex: 0 0 auto; /* NEW: never let this shrink */
+  width: 100%;
+  text-align: center;
+  font-family: var(--font-ui);
+  font-size: var(--font-sm);
+  font-weight: var(--font-weight-semibold);
+  padding-top: var(--space-2);
+  padding-bottom: var(--space-2);
+  border-bottom: var(--border-width) solid var(--border-hairline);
+}
+
+.channel-group__label {
+  font-size: calc(var(--tab-close-font) * var(--panel-scale, 1));
+}
+
+/* --- graph strip, sits above the gain section ---
+   Requires the shared parent (whatever renders <GainSection />) to be
+   position: relative — it already must be, for .gain-section's absolute
+   bottom:0 to anchor correctly. */
+.linear-graph-section {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: var(--dsp-control-heigth);
+
+  box-sizing: border-box;
+  padding: var(--space-4);
+
+  background: var(--bg-panel);
+  z-index: 10; /* stays below .gain-section's z-index: 20 */
+}

src/components/dsp408/LinearGraph/LinearGraph.tsx

@@ -0,0 +1,346 @@
+import {
+  forwardRef,
+  useCallback,
+  useEffect,
+  useImperativeHandle,
+  useMemo,
+  useRef,
+  useState,
+} from 'react';
+import styles from './LinearGraph.css';
+
+/**
+ * Coordinate-space helpers passed into your draw callback.
+ * Everything here works in DATA units (e.g. seconds, Hz, volts) —
+ * you never have to think about pixels or devicePixelRatio.
+ */
+export interface LinearGraphHelpers {
+  /** data (x, y) -> canvas pixel (px, py) */
+  toPx: (x: number, y: number) => [number, number];
+  /** data x -> pixel x */
+  toPxX: (x: number) => number;
+  /** data y -> pixel y */
+  toPxY: (y: number) => number;
+  /** pixel (px, py) -> data (x, y). Useful for handling clicks/drags. */
+  toData: (px: number, py: number) => [number, number];
+  /** size of the plot area in CSS pixels (inside the axes/padding) */
+  plot: { x: number; y: number; width: number; height: number };
+  ctx: CanvasRenderingContext2D;
+}
+
+export type DrawFn = (helpers: LinearGraphHelpers) => void;
+
+export interface LinearGraphHandle {
+  /** Force a redraw (e.g. after mutating a ref-held buffer without a re-render) */
+  redraw: () => void;
+  /** Access the raw canvas, e.g. for exporting a PNG */
+  getCanvas: () => HTMLCanvasElement | null;
+}
+
+export interface LinearGraphProps {
+  xMin: number;
+  xMax: number;
+  /** grid + tick spacing on x. Omit to auto-pick a "nice" step. */
+  xStep?: number;
+  yMin: number;
+  yMax: number;
+  yStep?: number;
+
+  /** Your drawing code. Called every time the graph needs to repaint. */
+  draw?: DrawFn;
+
+  width?: number;
+  height?: number;
+  /** padding (px) reserved for axis labels, in CSS pixels */
+  padding?: { top?: number; right?: number; bottom?: number; left?: number };
+
+  showGrid?: boolean;
+  showAxes?: boolean;
+  showTicks?: boolean;
+  xLabel?: string;
+  yLabel?: string;
+  /** format a tick value, e.g. (v) => v.toFixed(1) or Hz->kHz */
+  formatX?: (v: number) => string;
+  formatY?: (v: number) => string;
+
+  className?: string;
+  style?: React.CSSProperties;
+}
+
+const defaultFormat = (v: number) => {
+  if (Math.abs(v) < 1e-9) return '0';
+  const abs = Math.abs(v);
+  if (abs >= 1000 || abs < 0.01) return v.toExponential(1);
+  return parseFloat(v.toFixed(4)).toString();
+};
+
+/** Pick a "nice" step (1/2/5 * 10^n) that yields ~targetTicks divisions */
+function niceStep(min: number, max: number, targetTicks = 8): number {
+  const range = Math.abs(max - min) || 1;
+  const raw = range / targetTicks;
+  const mag = Math.pow(10, Math.floor(Math.log10(raw)));
+  const norm = raw / mag;
+  const step = norm < 1.5 ? 1 : norm < 3.5 ? 2 : norm < 7.5 ? 5 : 10;
+  return step * mag;
+}
+
+function range(min: number, max: number, step: number): number[] {
+  if (step <= 0) return [];
+  const out: number[] = [];
+  const start = Math.ceil((min - 1e-9) / step) * step;
+  for (let v = start; v <= max + 1e-9; v += step) {
+    // snap to avoid float drift like 0.30000000000000004
+    out.push(Math.round(v / step) * step);
+  }
+  return out;
+}
+
+export const LinearGraph = forwardRef<LinearGraphHandle, LinearGraphProps>(function LinearGraph(
+  {
+    xMin,
+    xMax,
+    xStep,
+    yMin,
+    yMax,
+    yStep,
+    draw,
+    width,
+    height,
+    padding,
+    showGrid = true,
+    showAxes = true,
+    showTicks = true,
+    xLabel,
+    yLabel,
+    formatX = defaultFormat,
+    formatY = defaultFormat,
+    className,
+    style,
+  },
+  ref
+) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+  const [size, setSize] = useState({ width: width ?? 600, height: height ?? 360 });
+
+  const pad = useMemo(
+    () => ({
+      top: padding?.top ?? 16,
+      right: padding?.right ?? 16,
+      bottom: padding?.bottom ?? (xLabel ? 44 : 28),
+      left: padding?.left ?? (yLabel ? 56 : 44),
+    }),
+    [padding, xLabel, yLabel]
+  );
+
+  const effXStep = xStep ?? niceStep(xMin, xMax);
+  const effYStep = yStep ?? niceStep(yMin, yMax);
+
+  // Responsive sizing when width/height aren't fixed
+  useEffect(() => {
+    if (width && height) return;
+    const el = containerRef.current;
+    if (!el) return;
+    const ro = new ResizeObserver((entries) => {
+      const entry = entries[0];
+      if (!entry) return;
+      const { width: w, height: h } = entry.contentRect;
+      if (w > 0 && h > 0) {
+        setSize({ width: width ?? w, height: height ?? h });
+      }
+    });
+    ro.observe(el);
+    return () => ro.disconnect();
+  }, [width, height]);
+
+  const paint = useCallback(() => {
+    const canvas = canvasRef.current;
+    if (!canvas) return;
+    const dpr = window.devicePixelRatio || 1;
+    const cssW = size.width;
+    const cssH = size.height;
+    if (canvas.width !== cssW * dpr || canvas.height !== cssH * dpr) {
+      canvas.width = cssW * dpr;
+      canvas.height = cssH * dpr;
+    }
+    const ctx = canvas.getContext('2d');
+    if (!ctx) return;
+    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
+    ctx.clearRect(0, 0, cssW, cssH);
+
+    const plot = {
+      x: pad.left,
+      y: pad.top,
+      width: Math.max(1, cssW - pad.left - pad.right),
+      height: Math.max(1, cssH - pad.top - pad.bottom),
+    };
+
+    const toPxX = (x: number) => plot.x + ((x - xMin) / (xMax - xMin || 1)) * plot.width;
+    const toPxY = (y: number) =>
+      plot.y + plot.height - ((y - yMin) / (yMax - yMin || 1)) * plot.height;
+    const toPx = (x: number, y: number): [number, number] => [toPxX(x), toPxY(y)];
+    const toData = (px: number, py: number): [number, number] => [
+      xMin + ((px - plot.x) / plot.width) * (xMax - xMin),
+      yMin + (1 - (py - plot.y) / plot.height) * (yMax - yMin),
+    ];
+
+    const css = getComputedStyle(canvas);
+    const gridColor = css.getPropertyValue('--graph-grid').trim() || '#2a2f3a';
+    const axisColor = css.getPropertyValue('--graph-axis').trim() || '#6b7280';
+    const textColor = css.getPropertyValue('--graph-text').trim() || '#9ca3af';
+    const bgColor = css.getPropertyValue('--graph-bg').trim();
+
+    if (bgColor) {
+      ctx.fillStyle = bgColor;
+      ctx.fillRect(plot.x, plot.y, plot.width, plot.height);
+    }
+
+    // clip to plot area so user drawing can't bleed into labels
+    ctx.save();
+    ctx.beginPath();
+    ctx.rect(plot.x, plot.y, plot.width, plot.height);
+    ctx.clip();
+
+    if (showGrid) {
+      ctx.strokeStyle = gridColor;
+      ctx.lineWidth = 1;
+      ctx.beginPath();
+      for (const gx of range(xMin, xMax, effXStep)) {
+        const px = Math.round(toPxX(gx)) + 0.5;
+        ctx.moveTo(px, plot.y);
+        ctx.lineTo(px, plot.y + plot.height);
+      }
+      for (const gy of range(yMin, yMax, effYStep)) {
+        const py = Math.round(toPxY(gy)) + 0.5;
+        ctx.moveTo(plot.x, py);
+        ctx.lineTo(plot.x + plot.width, py);
+      }
+      ctx.stroke();
+    }
+
+    if (showAxes) {
+      ctx.strokeStyle = axisColor;
+      ctx.lineWidth = 1.5;
+      ctx.beginPath();
+      if (yMin <= 0 && yMax >= 0) {
+        const py = Math.round(toPxY(0)) + 0.5;
+        ctx.moveTo(plot.x, py);
+        ctx.lineTo(plot.x + plot.width, py);
+      }
+      if (xMin <= 0 && xMax >= 0) {
+        const px = Math.round(toPxX(0)) + 0.5;
+        ctx.moveTo(px, plot.y);
+        ctx.lineTo(px, plot.y + plot.height);
+      }
+      ctx.stroke();
+    }
+
+    // hand off to user drawing code, still clipped to plot area
+    draw?.({ toPx, toPxX, toPxY, toData, plot, ctx });
+
+    ctx.restore();
+
+    // border
+    ctx.strokeStyle = axisColor;
+    ctx.lineWidth = 1;
+    ctx.strokeRect(
+      Math.round(plot.x) + 0.5,
+      Math.round(plot.y) + 0.5,
+      Math.round(plot.width) - 1,
+      Math.round(plot.height) - 1
+    );
+
+    // ticks + labels (outside clip)
+    if (showTicks) {
+      ctx.fillStyle = textColor;
+      ctx.font = '11px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace';
+      ctx.textAlign = 'center';
+      ctx.textBaseline = 'top';
+      for (const gx of range(xMin, xMax, effXStep)) {
+        const px = toPxX(gx);
+        ctx.beginPath();
+        ctx.moveTo(px, plot.y + plot.height);
+        ctx.lineTo(px, plot.y + plot.height + 4);
+        ctx.strokeStyle = axisColor;
+        ctx.stroke();
+        ctx.fillText(formatX(gx), px, plot.y + plot.height + 6);
+      }
+      ctx.textAlign = 'right';
+      ctx.textBaseline = 'middle';
+      for (const gy of range(yMin, yMax, effYStep)) {
+        const py = toPxY(gy);
+        ctx.beginPath();
+        ctx.moveTo(plot.x - 4, py);
+        ctx.lineTo(plot.x, py);
+        ctx.strokeStyle = axisColor;
+        ctx.stroke();
+        ctx.fillText(formatY(gy), plot.x - 6, py);
+      }
+    }
+
+    if (xLabel) {
+      ctx.fillStyle = textColor;
+      ctx.font = '12px system-ui, sans-serif';
+      ctx.textAlign = 'center';
+      ctx.textBaseline = 'bottom';
+      ctx.fillText(xLabel, plot.x + plot.width / 2, cssH - 4);
+    }
+    if (yLabel) {
+      ctx.save();
+      ctx.fillStyle = textColor;
+      ctx.font = '12px system-ui, sans-serif';
+      ctx.textAlign = 'center';
+      ctx.textBaseline = 'top';
+      ctx.translate(12, plot.y + plot.height / 2);
+      ctx.rotate(-Math.PI / 2);
+      ctx.fillText(yLabel, 0, 0);
+      ctx.restore();
+    }
+  }, [
+    size,
+    pad,
+    xMin,
+    xMax,
+    effXStep,
+    yMin,
+    yMax,
+    effYStep,
+    showGrid,
+    showAxes,
+    showTicks,
+    xLabel,
+    yLabel,
+    formatX,
+    formatY,
+    draw,
+  ]);
+
+  useEffect(() => {
+    paint();
+  }, [paint]);
+
+  useImperativeHandle(ref, () => ({
+    redraw: paint,
+    getCanvas: () => canvasRef.current,
+  }));
+
+  return (
+    <div
+      ref={containerRef}
+      className={'container'}
+      style={{
+        width: width ?? '100%',
+        height: height ?? '100%',
+        ...style,
+      }}
+    >
+      <canvas
+        ref={canvasRef}
+        className={'canvas'}
+        style={{ width: size.width, height: size.height }}
+      />
+    </div>
+  );
+});
+
+export default LinearGraph;

src/components/dsp408/Slider/VerticalSlider.css

@@ -1,25 +1,27 @@
 .gauge-viewport {
-  container-type: inline-size;
+  position: relative;
-  container-name: gauge;
 
-  width: 100%;
+  flex: 1 1 0;
+  min-height: 0;
+  width: auto;
   aspect-ratio: 70 / 260;
 
-  box-sizing: border-box;
+  overflow: hidden;
 }
 
 .gauge-container {
-  width: 100%;
+  position: absolute;
-  height: 100%;
+  top: 50%;
+  left: 50%;
 
-  padding-top: 28.571cqw; /* 20px */
+  width: 70px;
-  padding-bottom: 14.286cqw; /* 10px */
+  height: 240px;
 
   display: flex;
   flex-direction: column;
   align-items: center;
 
-  transform-origin: top center;
+  transform-origin: center center;
 
   box-sizing: border-box;
 }
@@ -27,23 +29,21 @@
 .gauge-track {
   position: relative;
 
-  width: 100%;
+  width: 70px;
-  height: 300cqw; /* 210px */
+  height: 210px;
 
   display: flex;
 
   justify-content: center;
   align-items: center;
 
-  margin-bottom: 11.429cqw; /* 8px */
+  margin-bottom: 8px;
-
-  box-sizing: border-box;
 }
 
 .slider {
   position: relative;
 
-  width: 34.286cqw; /* 24px */
+  width: 24px;
   height: 100%;
 
   cursor: pointer;
@@ -60,7 +60,7 @@
 
   transform: translateX(-50%);
 
-  width: 2.857cqw; /* 2px */
+  width: 2px;
 
   height: 100%;
 
@@ -74,7 +74,7 @@
 
   left: 50%;
 
-  width: 25.714cqw; /* 18px */
+  width: 18px;
 
   aspect-ratio: 1;
 
@@ -106,9 +106,9 @@
 }
 
 .ticks span {
-  width: 14.286cqw; /* 10px */
+  width: 10px;
 
-  height: 2.857cqw; /* 2px */
+  height: 2px;
 
   background: var(--border-hairline);
 
@@ -116,22 +116,22 @@
 }
 
 .left {
-  left: 11.429cqw; /* 8px */
+  left: 8px;
 }
 
 .right {
-  right: 11.429cqw; /* 8px */
+  right: 8px;
 }
 
 .value {
   width: 100%;
 
-  margin-top: 5.714cqw; /* 4px */
+  margin-top: 4px;
 
-  padding-top: 2.857cqw; /* 2px */
+  padding-top: 2px;
-  padding-bottom: 2.857cqw; /* 2px */
+  padding-bottom: 2px;
-  padding-right: 5.714cqw; /* 4px */
+  padding-right: 4px;
-  padding-left: 5.714cqw; /* 4px */
+  padding-left: 4px;
 
   box-sizing: border-box;
 
@@ -146,9 +146,10 @@
 
   color: var(--accent-brand);
 
-  font-size: 22.857cqw;
+  font-size: var(--font-xxs);
 
-  font-family: var(--font-ui);
+  font-family: var(--font-mono);
+  font-weight: var(--font-weight-medium);
 
   box-shadow: var(--shadow-sm);
 
@@ -167,7 +168,7 @@
 
   background: transparent;
 
-  border: 1px solid var(--border-hairline);
+  border: var(--border-width) solid var(--border-hairline);
 
   border-radius: var(--radius-sm);
 

src/components/dsp408/Slider/VerticalSlider.tsx

@@ -2,12 +2,8 @@ import { useMemo, useRef, useState, useEffect } from 'react';
 
 import './VerticalSlider.css';
 
-// Design size 260*70 (height*width) — kept as the reference ratio.
-// All CSS dimensions are expressed in container-query width units (cqw)
-// relative to this DESIGN_WIDTH, so the whole component scales together
-// and preserves this aspect ratio at any rendered size.
-
 const DESIGN_WIDTH = 70;
+const DESIGN_HEIGHT = 240;
 
 type VerticalSliderProps = {
   min: number;
@@ -59,6 +55,24 @@ export default function VerticalSlider({
   const thumbRef = useRef<HTMLDivElement>(null);
   const keyboardEditing = useRef(false);
 
+  const viewportRef = useRef<HTMLDivElement>(null);
+  const [scale, setScale] = useState(1);
+
+  useEffect(() => {
+    const el = viewportRef.current;
+    if (!el) return;
+
+    const observer = new ResizeObserver((entries) => {
+      const entry = entries[0];
+      const { width, height } = entry.contentRect;
+      if (width === 0 || height === 0) return;
+      setScale(Math.min(width / DESIGN_WIDTH, height / DESIGN_HEIGHT));
+    });
+
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, []);
+
   useEffect(() => {
     if (keyboardEditing.current) return;
 
@@ -76,26 +90,6 @@ export default function VerticalSlider({
     [step, switchStep]
   );
 
-  const maxChars = useMemo(() => {
-    const minStr = min.toFixed(decimals);
-    const maxStr = max.toFixed(decimals);
-    return Math.max(minStr.length, maxStr.length) + unit.length;
-  }, [min, max, decimals, unit]);
-
-  // Computed in "design pixels" (i.e. assuming the component is rendered at
-  // DESIGN_WIDTH px wide), then converted below to cqw so it scales with
-  // the actual rendered size instead of staying a fixed pixel value.
-  const valueFontSize = useMemo(() => {
-    const availableWidth = DESIGN_WIDTH - 8;
-    const AVG_CHAR_WIDTH_RATIO = 0.6;
-    const sizeByWidth = availableWidth / (maxChars * AVG_CHAR_WIDTH_RATIO);
-    return Math.min(16, Math.max(8, sizeByWidth));
-  }, [maxChars]);
-
-  // Convert the "design px" font size into cqw units relative to the
-  // component's own width, so it scales proportionally with everything else.
-  const valueFontSizeCqw = useMemo(() => (valueFontSize / DESIGN_WIDTH) * 100, [valueFontSize]);
-
   function normalizeValue(input: number) {
     const clamped = Math.min(max, Math.max(min, input));
     const snapped = Math.round(clamped / currentStep) * currentStep;
@@ -202,8 +196,15 @@ export default function VerticalSlider({
   const percent = (value - min) / (max - min);
 
   return (
-    <div className={['gauge-viewport', className].filter(Boolean).join(' ')} style={style}>
+    <div
-      <div className="gauge-container">
+      className={['gauge-viewport', className].filter(Boolean).join(' ')}
+      style={style}
+      ref={viewportRef}
+    >
+      <div
+        className="gauge-container"
+        style={{ transform: `translate(-50%, -50%) scale(${scale})` }}
+      >
         <div className="gauge-track">
           <div className="ticks left">
             {Array.from({ length: 15 }).map((_, i) => (
@@ -233,7 +234,7 @@ export default function VerticalSlider({
           </div>
         </div>
 
-        <div className="value" style={{ fontSize: `${valueFontSizeCqw}cqw` }}>
+        <div className="value">
           <input
             ref={inputRef}
             type="text"

src/hooks/useDSPPolling.ts

@@ -0,0 +1,82 @@
+import { useEffect, useRef } from 'react';
+import { DSP } from '../types/types';
+import { getDSP408MeterLevels } from '../api/dsp408';
+
+export function useDSPPolling(
+  dsps: DSP[],
+  selected: number | null,
+  setDsps: React.Dispatch<React.SetStateAction<DSP[]>>
+) {
+  const dspsRef = useRef(dsps);
+  const selectedRef = useRef(selected);
+
+  // Keep refs up to date without restarting the polling loops
+  useEffect(() => {
+    dspsRef.current = dsps;
+  }, [dsps]);
+
+  useEffect(() => {
+    selectedRef.current = selected;
+  }, [selected]);
+
+  useEffect(() => {
+    let stopped = false;
+
+    const pollDSP = async (dsp: DSP) => {
+      try {
+        const meters = await getDSP408MeterLevels(dsp.id);
+
+        if (stopped) return;
+
+        setDsps((prev) => prev.map((d) => (d.id === dsp.id ? { ...d, meters } : d)));
+      } catch (err) {
+        if (!stopped) {
+          console.error(`Meter polling failed for ${dsp.name}:`, err);
+        }
+      }
+    };
+
+    const activeLoop = async () => {
+      if (stopped) return;
+
+      const activeId = selectedRef.current;
+
+      if (activeId !== null) {
+        const dsp = dspsRef.current.find((d) => d.id === activeId && d.status === 'connected');
+
+        if (dsp) {
+          await pollDSP(dsp);
+        }
+      }
+
+      if (!stopped) {
+        setTimeout(activeLoop, 500);
+      }
+    };
+
+    const inactiveLoop = async () => {
+      if (stopped) return;
+
+      const activeId = selectedRef.current;
+
+      const inactiveDsps = dspsRef.current.filter(
+        (dsp) => dsp.status === 'connected' && dsp.id !== activeId
+      );
+
+      // Poll inactive connected DSPs
+      await Promise.all(inactiveDsps.map((dsp) => pollDSP(dsp)));
+
+      if (!stopped) {
+        setTimeout(inactiveLoop, 5000);
+      }
+    };
+
+    // Start both loops
+    activeLoop();
+    inactiveLoop();
+
+    return () => {
+      stopped = true;
+    };
+  }, [setDsps]);
+}

src/pages/AddDspPage/AddDspPage.tsx

@@ -10,7 +10,7 @@ function AddDSPForm({
   onAdd,
 }: {
   onCancel: () => void;
-  onAdd: (d: Omit<DSP, 'status' | 'id'>) => void;
+  onAdd: (d: Omit<DSP, 'status' | 'id' | 'state' | 'meters'>) => void;
 }) {
   const [form, setForm] = useState({
     name: '',

src/pages/DspPage/DspPage.tsx

@@ -6,6 +6,8 @@ import ConnectionPanel from '../../components/dsp408/ConnectionSection/Connectio
 import GainSection from '../../components/dsp408/GainSection/GainSection';
 import { NotificationType } from '../../types/types';
 import './DspPage.css';
+import GateSection from '../../components/dsp408/GateSection/GateSection';
+import { invoke } from '@tauri-apps/api/core';
 
 function DSPPage({
   dsp,
@@ -129,6 +131,41 @@ function DSPPage({
     },
   ];
 
+  const presets = dsp.state?.presets.names?.map((name, index) => ({
+    id: index === 0 ? 'f00' : `u${String(index).padStart(2, '0')}`,
+    name,
+  })) ?? [
+    {
+      id: 'f00',
+      name: 'Factory Preset',
+    },
+    ...Array.from({ length: 20 }, (_, index) => ({
+      id: `u${String(index + 1).padStart(2, '0')}`,
+      name: 'Default Preset',
+    })),
+  ];
+  const selectedPreset = dsp.state?.presets.current_index ?? 0;
+
+  const recallPreset = async (presetIndex: number) => {
+    try {
+      const success = await invoke<boolean>('recall_preset', {
+        id: dsp.id,
+        presetIndex,
+      });
+
+      if (success) {
+        notify(`Preset ${presetIndex} recalled`, 'success', dsp.name);
+      } else {
+        notify('Failed to recall preset', 'error', dsp.name);
+      }
+
+      return success;
+    } catch (err) {
+      notify(`Preset recall failed: ${String(err)}`, 'error', dsp.name);
+      return false;
+    }
+  };
+
   const renderTab = () => {
     switch (activeSidebar) {
       case 'overview':
@@ -137,6 +174,9 @@ function DSPPage({
       case 'gain':
         return <GainSection dsp={dsp} notify={notify} />;
 
+      case 'gate':
+        return <GateSection dsp={dsp} notify={notify} />;
+
       default:
         return null;
     }
@@ -149,6 +189,15 @@ function DSPPage({
         activeId={activeSidebar}
         onSelect={setActiveSidebar}
         appName={dsp.name}
+        appOptions={presets}
+        selectedAppId={presets[selectedPreset]?.id}
+        onAppChange={(id) => {
+          const presetIndex = presets.findIndex((preset) => preset.id === id);
+
+          if (presetIndex !== -1) {
+            recallPreset(presetIndex);
+          }
+        }}
         expanded={sidebarExpanded}
         onToggle={() => setSidebarExpanded((v) => !v)}
       />

src/types/dsp408State.ts

@@ -191,3 +191,7 @@ export type DSPState = {
   presets: PresetBank;
   current_config: DSPConfigState;
 };
+
+export interface Meters {
+  levels: number[];
+}

src/types/types.ts

@@ -1,3 +1,5 @@
+import { DSPState, Meters } from './dsp408State';
+
 export type DSPStatus = 'connected' | 'connecting' | 'disconnected';
 
 export type DSP = {
@@ -8,6 +10,8 @@ export type DSP = {
   port: number;
   deviceId: string;
   status: DSPStatus;
+  state: DSPState | null;
+  meters: Meters | null;
 };
 
 export const DSP_TYPES = [

src/variables.css

@@ -20,6 +20,7 @@
   --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
 
   /* ---------- Font ---------- */
+  --font-xxs: 0.66rem;
   --font-xs: 0.75rem;
   --font-sm: 0.875rem;
   --font-md: 1rem;
@@ -86,4 +87,7 @@
   /* ---------- SideBar ---------- */
   --sidebar-width-collapsed: calc(var(--header-height) * 0.85 + 2 * var(--space-3));
   --sidebar-width-expanded: 200px;
+
+  /* ---------- DSP ---------- */
+  --dsp-control-heigth: 40vh;
 }