diff --git a/src/App.tsx b/src/App.tsx
index 632346c..583dc06 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -3,7 +3,7 @@ import { invoke } from '@tauri-apps/api/core';
 import { useState } from 'react';
 import './styles/App.css';
 import { DSP, DSPStatus, AppPage } from './types/types';
-import TopBar from './components/topbar/Topbar';
+import TopBar from './components/Topbar/Topbar';
 import DSPPage from './pages/DspPage/DspPage';
 import AddDSPForm from './pages/AddDspPage';
 import { useNotifications } from './hooks/useNotifications';
diff --git a/src/assets/icons/AnimatedLogo.tsx b/src/assets/icons/AnimatedLogo.tsx
index 6e2490e..a9a442e 100644
--- a/src/assets/icons/AnimatedLogo.tsx
+++ b/src/assets/icons/AnimatedLogo.tsx
@@ -6,7 +6,7 @@ const DONUT_HOVER_SPEED = 360 / 2;
 const INNER_BASE_SPEED = 360 / 12;
 const INNER_HOVER_SPEED = 360 / 3;
 
-const AnimatedLogo = ({ size = 45, className = '' }) => {
+const AnimatedLogo = ({ className = '' }) => {
   const [isHovered, setIsHovered] = useState(false);
   const isHoveredRef = useRef(false);
   const donutGroupRef = useRef<SVGGElement | null>(null);
@@ -58,7 +58,6 @@ const AnimatedLogo = ({ size = 45, className = '' }) => {
   return (
     <div
       className={`animated-logo ${className}`}
-      style={{ width: size, height: size }}
       onMouseEnter={() => setIsHovered(true)}
       onMouseLeave={() => setIsHovered(false)}
     >
diff --git a/src/assets/icons/AudioIcons.tsx b/src/assets/icons/AudioIcons.tsx
index 19624b3..776429c 100644
--- a/src/assets/icons/AudioIcons.tsx
+++ b/src/assets/icons/AudioIcons.tsx
@@ -31,3 +31,36 @@ export function SlidersIcon(props: React.SVGProps<SVGSVGElement>) {
     </svg>
   );
 }
+
+export function AudioWaveIcon(props: React.SVGProps<SVGSVGElement>) {
+  return (
+    <svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" {...props}>
+      <path
+        d="M2 10V14M6 6V18M10 3V21M14 8V16M18 5V19M22 10V14"
+        stroke="currentColor"
+        strokeWidth="2"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+      />
+    </svg>
+  );
+}
+
+export function KnobGainIcon(props: React.SVGProps<SVGSVGElement>) {
+  return (
+    <svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" {...props}>
+      <path d="M12 3A9 9 0 0 1 21 12" stroke="currentColor" strokeWidth="2" strokeLinecap="round" />
+
+      <path
+        d="M12 21A9 9 0 1 1 18.4 6.6"
+        stroke="currentColor"
+        strokeWidth="2"
+        strokeLinecap="round"
+      />
+
+      <circle cx="12" cy="12" r="6" stroke="currentColor" strokeWidth="2" />
+
+      <path d="M12 12L15 9" stroke="currentColor" strokeWidth="2" strokeLinecap="round" />
+    </svg>
+  );
+}
diff --git a/src/components/Button/Button.css b/src/components/Button/Button.css
index 5dd8892..00ee527 100644
--- a/src/components/Button/Button.css
+++ b/src/components/Button/Button.css
@@ -8,6 +8,9 @@
   font-weight: 500;
   cursor: pointer;
   border: 1px solid transparent;
+  display: flex;
+  align-items: center;
+  justify-content: center;
   transition:
     background var(--dur-base) var(--ease-standard),
     border-color var(--dur-base) var(--ease-standard),
diff --git a/src/components/Button/Button.tsx b/src/components/Button/Button.tsx
index f9d2186..0b9403e 100644
--- a/src/components/Button/Button.tsx
+++ b/src/components/Button/Button.tsx
@@ -70,22 +70,22 @@ export default function Button({
   }, [fontSize, children, W]);
 
   const button = (
-  <button
-    type={type}
-    className={`btn btn-${variant} ${className}`}
-    onClick={onClick}
-    disabled={disabled}
-    style={{
-      width: scale ? '100%' : W,
-      height: scale ? '100%' : H,
-      fontSize: `${computedFontSize}px`,
-      ...style,
-    }}
-    {...props}
-  >
-    {children}
-  </button>
-);
+    <button
+      type={type}
+      className={`btn btn-${variant} ${className}`}
+      onClick={onClick}
+      disabled={disabled}
+      style={{
+        width: scale ? '100%' : W,
+        height: scale ? '100%' : H,
+        fontSize: `${computedFontSize}px`,
+        ...style,
+      }}
+      {...props}
+    >
+      {children}
+    </button>
+  );
 
   if (!scale) return button;
 
diff --git a/src/components/Sidebar/Sidebar.css b/src/components/Sidebar/Sidebar.css
index 3ef1544..6363703 100644
--- a/src/components/Sidebar/Sidebar.css
+++ b/src/components/Sidebar/Sidebar.css
@@ -1,12 +1,11 @@
 /* ---------- Label ---------- */
 
 .sidebar-label {
+  font-size: var(--sidebar-label-size);
   opacity: 0;
   max-width: 0;
-
   overflow: hidden;
   white-space: nowrap;
-
   transition:
     opacity var(--dur-fast) var(--ease-standard),
     max-width var(--dur-base) var(--ease-standard);
diff --git a/src/components/dsp408/ChannelGroup/ChannelGroup.css b/src/components/dsp408/ChannelGroup/ChannelGroup.css
new file mode 100644
index 0000000..2df995f
--- /dev/null
+++ b/src/components/dsp408/ChannelGroup/ChannelGroup.css
@@ -0,0 +1,43 @@
+.channel-group {
+  position: relative;
+  height: calc(100% - var(--space-1) - var(--space-1));
+  flex: 0 0 auto;
+
+  display: flex;
+  align-items: flex-end;
+
+  border: 1px solid var(--border-hairline);
+  border-radius: var(--radius-md);
+
+  /* enough top padding to fully clear the label's own height, not just its border-overlap */
+  padding: calc(1.2vh + var(--space-3)) var(--space-3) 0;
+  margin-bottom: var(--space-1);
+  margin-top: var(--space-1);
+  box-sizing: border-box;
+  overflow: visible; /* in case something upstream set hidden */
+}
+
+.channel-group__label {
+  position: absolute;
+  top: var(--space-2); /* sits inside the padded space, not straddling the border */
+  left: 50%;
+  transform: translateX(-50%); /* only horizontal centering now — no vertical overlap */
+
+  padding: 0 var(--space-2);
+
+  font-family: var(--font-ui);
+  font-size: var(--tab-close-font);
+  font-weight: 600;
+  color: var(--text-muted);
+
+  white-space: nowrap;
+  line-height: 1;
+}
+
+.channel-group__items {
+  display: flex;
+  flex-direction: row;
+  align-items: stretch;
+  height: 100%;
+  gap: var(--space-4);
+}
diff --git a/src/components/dsp408/ChannelGroup/ChannelGroup.tsx b/src/components/dsp408/ChannelGroup/ChannelGroup.tsx
new file mode 100644
index 0000000..82a622d
--- /dev/null
+++ b/src/components/dsp408/ChannelGroup/ChannelGroup.tsx
@@ -0,0 +1,13 @@
+// ChannelGroup.tsx
+import './ChannelGroup.css';
+
+function ChannelGroup({ title, children }: { title: string; children: React.ReactNode }) {
+  return (
+    <div className="channel-group">
+      <div className="channel-group__label">{title}</div>
+      <div className="channel-group__items">{children}</div>
+    </div>
+  );
+}
+
+export default ChannelGroup;
diff --git a/src/components/dsp408/ConnectionSection/ConnectionSection.css b/src/components/dsp408/ConnectionSection/ConnectionSection.css
index 161c510..687e444 100644
--- a/src/components/dsp408/ConnectionSection/ConnectionSection.css
+++ b/src/components/dsp408/ConnectionSection/ConnectionSection.css
@@ -14,6 +14,13 @@
   position: relative;
 }
 
+.panel-type {
+  margin-top: var(--space-1);
+  font-size: 12px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+  letter-spacing: 0.03em;
+}
 
 .panel-header {
   display: flex;
@@ -32,6 +39,9 @@
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
+  margin: 0;
+  font-size: 18px;
+  font-weight: 600;
 }
 
 .mono {
@@ -48,15 +58,15 @@
   position: absolute;
   right: 16px;
   bottom: 16px;
-  margin: 0;   /* drop margin-top: auto, no longer needed */
-  padding: 0;  /* drop padding-top: 16px, spacing now handled by right/bottom offsets */
+  margin: 0; /* drop margin-top: auto, no longer needed */
+  padding: 0; /* drop padding-top: 16px, spacing now handled by right/bottom offsets */
 }
 
 .connection-section {
-  position: absolute;   /* was: fixed — relative to .dsp-content now */
-  inset: 0;              /* replaces top:0; right:0; bottom:0; left:0 */
+  position: absolute; /* was: fixed — relative to .dsp-content now */
+  inset: 0; /* replaces top:0; right:0; bottom:0; left:0 */
 
   display: flex;
   justify-content: center;
   align-items: center;
-}
\ No newline at end of file
+}
diff --git a/src/components/dsp408/ConnectionSection/ConnectionSection.tsx b/src/components/dsp408/ConnectionSection/ConnectionSection.tsx
index 2816d26..80439ae 100644
--- a/src/components/dsp408/ConnectionSection/ConnectionSection.tsx
+++ b/src/components/dsp408/ConnectionSection/ConnectionSection.tsx
@@ -27,71 +27,77 @@ function ConnectionPanel({
         : 'Disconnected';
 
   return (
-    <div className='connection-section'>
-    <div
-      className="connection-panel-frame"
-      style={{ '--panel-w': DESIGN_WIDTH, '--panel-h': DESIGN_HEIGHT } as React.CSSProperties}
-    >
-      <AutoScale designWidth={DESIGN_WIDTH} designHeight={DESIGN_HEIGHT}>
-        <div className="card panel" style={{ width: DESIGN_WIDTH, height: DESIGN_HEIGHT }}>
-          <div className="panel-header">
-            <div className="panel-header-text">
-              <h1 className="panel-title" title={dsp.name}>
-                {dsp.name}
-              </h1>
-              <div className="panel-type">{dsp.type}</div>
+    <div className="connection-section">
+      <div
+        className="connection-panel-frame"
+        style={{ '--panel-w': DESIGN_WIDTH, '--panel-h': DESIGN_HEIGHT } as React.CSSProperties}
+      >
+        <AutoScale designWidth={DESIGN_WIDTH} designHeight={DESIGN_HEIGHT}>
+          <div className="card panel" style={{ width: DESIGN_WIDTH, height: DESIGN_HEIGHT }}>
+            <div className="panel-header">
+              <div className="panel-header-text">
+                <h1 className="panel-title" title={dsp.name}>
+                  {dsp.name}
+                </h1>
+                <div className="panel-type">{dsp.type}</div>
+              </div>
+
+              <div className="status-block">
+                <span className={`led led--lg led--${dsp.status}`} />
+                <span className={`status-label status-label--${dsp.status}`}>{statusLabel}</span>
+              </div>
             </div>
 
-            <div className="status-block">
-              <span className={`led led--lg led--${dsp.status}`} />
-              <span className={`status-label status-label--${dsp.status}`}>{statusLabel}</span>
+            <dl className="specs">
+              <div className="spec">
+                <dt>IP address</dt>
+                <dd className="mono" title={dsp.ip}>
+                  {dsp.ip}
+                </dd>
+              </div>
+
+              <div className="spec">
+                <dt>Port</dt>
+                <dd className="mono">{dsp.port}</dd>
+              </div>
+
+              <div className="spec">
+                <dt>Device ID</dt>
+                <dd className="mono" title={dsp.deviceId || undefined}>
+                  {dsp.deviceId || '—'}
+                </dd>
+              </div>
+            </dl>
+
+            <div className="panel-actions">
+              {dsp.status === 'connected' ? (
+                <Button
+                  variant="outline"
+                  designWidth={BTN_W}
+                  designHeight={BTN_H}
+                  scale={false}
+                  onClick={onDisconnect}
+                >
+                  Disconnect
+                </Button>
+              ) : (
+                <Button
+                  variant="primary"
+                  designWidth={BTN_W}
+                  designHeight={BTN_H}
+                  scale={false}
+                  onClick={onConnect}
+                  disabled={dsp.status === 'connecting'}
+                >
+                  {dsp.status === 'connecting' ? 'Connecting…' : 'Connect'}
+                </Button>
+              )}
             </div>
           </div>
-
-          <dl className="specs">
-            <div className="spec">
-              <dt>IP address</dt>
-              <dd className="mono" title={dsp.ip}>
-                {dsp.ip}
-              </dd>
-            </div>
-
-            <div className="spec">
-              <dt>Port</dt>
-              <dd className="mono">{dsp.port}</dd>
-            </div>
-
-            <div className="spec">
-              <dt>Device ID</dt>
-              <dd className="mono" title={dsp.deviceId || undefined}>
-                {dsp.deviceId || '—'}
-              </dd>
-            </div>
-          </dl>
-
-          <div className="panel-actions">
-            {dsp.status === 'connected' ? (
-              <Button variant="outline" designWidth={BTN_W} designHeight={BTN_H} scale={false} onClick={onDisconnect}>
-                Disconnect
-              </Button>
-            ) : (
-              <Button
-                variant="primary"
-                designWidth={BTN_W}
-                designHeight={BTN_H}
-                scale={false}
-                onClick={onConnect}
-                disabled={dsp.status === 'connecting'}
-              >
-                {dsp.status === 'connecting' ? 'Connecting…' : 'Connect'}
-              </Button>
-            )}
-          </div>
-        </div>
-      </AutoScale>
-    </div>
+        </AutoScale>
+      </div>
     </div>
   );
 }
 
-export default ConnectionPanel;
\ No newline at end of file
+export default ConnectionPanel;
diff --git a/src/components/dsp408/GainSection/GainSection.css b/src/components/dsp408/GainSection/GainSection.css
index 178314e..ef15ee5 100644
--- a/src/components/dsp408/GainSection/GainSection.css
+++ b/src/components/dsp408/GainSection/GainSection.css
@@ -1,10 +1,6 @@
-:root {
-  --gain-section-height: 40vh;
-}
-
 .gain-section {
-  position: absolute;   /* was: fixed — now relative to .dsp-content, which is the fixed+inset parent */
-  left: 0;               /* was: var(--sidebar-width-collapsed) — .dsp-content already excludes the sidebar */
+  position: absolute; /* was: fixed — now relative to .dsp-content, which is the fixed+inset parent */
+  left: 0; /* was: var(--sidebar-width-collapsed) — .dsp-content already excludes the sidebar */
   right: 0;
   bottom: 0;
 
@@ -42,7 +38,7 @@
 .gain-panel-frame {
   flex: 0 0 auto;
   height: calc(100% - 8px);
-  aspect-ratio: var(--panel-w) / var(--panel-h);  /* now driven by JS, not duplicated */
+  aspect-ratio: var(--panel-w) / var(--panel-h); /* now driven by JS, not duplicated */
   margin: 4px 0;
   box-sizing: border-box;
 }
diff --git a/src/components/dsp408/GainSection/GainSection.tsx b/src/components/dsp408/GainSection/GainSection.tsx
index ddd3df5..0ada2d0 100644
--- a/src/components/dsp408/GainSection/GainSection.tsx
+++ b/src/components/dsp408/GainSection/GainSection.tsx
@@ -6,6 +6,7 @@ import { NotificationType } from '../../../types/types';
 import { useState } from 'react';
 import Button from '../../Button/Button';
 import AutoScale from '../../AutoScale/AutoScale';
+import ChannelGroup from '../ChannelGroup/ChannelGroup';
 import './GainSection.css';
 
 const DESIGN_WIDTH = 90;
@@ -139,12 +140,14 @@ function GainSection({
   dsp: DSP;
   notify: (message: string, type?: NotificationType, dspName?: string) => void;
 }) {
-  const channels: { channel: Channel; title: string }[] = [
+  const inputs: { channel: Channel; title: string }[] = [
     { channel: { Input: InputChannel.InA }, title: 'In A' },
     { channel: { Input: InputChannel.InB }, title: 'In B' },
     { channel: { Input: InputChannel.InC }, title: 'In C' },
     { channel: { Input: InputChannel.InD }, title: 'In D' },
+  ];
 
+  const outputs: { channel: Channel; title: string }[] = [
     { channel: { Output: OutputChannel.Out1 }, title: 'Out 1' },
     { channel: { Output: OutputChannel.Out2 }, title: 'Out 2' },
     { channel: { Output: OutputChannel.Out3 }, title: 'Out 3' },
@@ -158,9 +161,17 @@ function GainSection({
   return (
     <div className="gain-section">
       <div className="gain-panels">
-        {channels.map(({ channel, title }) => (
-          <GainPanel key={title} dsp={dsp} notify={notify} channel={channel} title={title} />
-        ))}
+        <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>
   );
diff --git a/src/components/topbar/Tab.tsx b/src/components/topbar/Tab.tsx
deleted file mode 100644
index a8bed6f..0000000
--- a/src/components/topbar/Tab.tsx
+++ /dev/null
@@ -1,40 +0,0 @@
-import { DSP } from '../../types/types';
-
-function Tab({
-  dsp,
-  active,
-  dimmed,
-  onSelect,
-  onRemove,
-}: {
-  dsp: DSP;
-  active: boolean;
-  dimmed: boolean;
-  onSelect: () => void;
-  onRemove: () => void;
-}) {
-  return (
-    <button
-      className={'tab' + (active ? ' tab--active' : '') + (dimmed ? ' tab--dimmed' : '')}
-      onClick={onSelect}
-    >
-      <span className={'led led--' + dsp.status} />
-      <span className="tab-name" title={dsp.name}>
-        {dsp.name}
-      </span>
-      <span
-        className="tab-close"
-        role="button"
-        aria-label={`Remove ${dsp.name}`}
-        onClick={(e) => {
-          e.stopPropagation();
-          onRemove();
-        }}
-      >
-        x
-      </span>
-    </button>
-  );
-}
-
-export default Tab;
diff --git a/src/components/topbar/Topbar.css b/src/components/topbar/Topbar.css
new file mode 100644
index 0000000..dd829b7
--- /dev/null
+++ b/src/components/topbar/Topbar.css
@@ -0,0 +1,148 @@
+.topbar {
+  display: flex;
+  align-items: center;
+  gap: var(--space-5);
+  padding: 0 var(--space-4);
+  height: var(--header-height);
+  background: var(--bg-void);
+  border-bottom: 1px solid var(--border-hairline);
+  -webkit-app-region: drag;
+}
+
+.logo-slot {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 80%;
+  aspect-ratio: 1 / 1;
+  width: auto;
+  flex-shrink: 0;
+  overflow: hidden;
+  -webkit-app-region: no-drag;
+}
+
+.logo-slot > * {
+  width: 100%;
+  height: 100%;
+}
+
+.tabstrip {
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  height: var(--header-height);
+  flex: 1 1 auto;
+  min-width: 0;
+  overflow-x: auto;
+  overflow-y: hidden;
+  -webkit-app-region: no-drag;
+  scrollbar-width: thin;
+  scrollbar-color: var(--border-hairline) transparent;
+  scroll-behavior: smooth;
+  scroll-padding-inline: var(--space-3);
+}
+
+.tab {
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+  height: var(--tab-height);
+  padding: 0 var(--space-3);
+  border: 1px solid var(--border-hairline);
+  border-radius: var(--radius-md);
+  background: transparent;
+  color: var(--text-muted);
+  font-family: var(--font-ui);
+  font-size: var(--tab-font-size);
+  cursor: pointer;
+  transition:
+    background var(--dur-base) var(--ease-standard),
+    border-color var(--dur-base) var(--ease-standard),
+    color var(--dur-base) var(--ease-standard);
+  width: var(--tab-width);
+  flex: 0 0 auto;
+}
+
+.tab-close {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex: 0 0 auto;
+  margin-left: auto;
+  width: var(--tab-close-size);
+  height: var(--tab-close-size);
+  padding: 0;
+  font-size: var(--tab-close-font);
+  line-height: 1;
+  color: var(--text-muted);
+  border-radius: 4px;
+  transition:
+    background var(--dur-fast) var(--ease-standard),
+    color var(--dur-fast) var(--ease-standard);
+}
+
+.tab-add {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: var(--tab-add-size);
+  height: var(--tab-add-size);
+  margin-left: 6px;
+  border: none;
+  border-radius: 50%;
+  background: transparent;
+  color: var(--text-muted);
+  cursor: pointer;
+  flex-shrink: 0;
+  transition:
+    background var(--dur-base) var(--ease-standard),
+    color var(--dur-base) var(--ease-standard);
+}
+
+.tab-add-empty {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  line-height: 1;
+  gap: 6px;
+  height: var(--tab-add-empty-height);
+  padding: 0 var(--space-3) 0 var(--space-3);
+  border: 1px dashed var(--border-hairline);
+  border-radius: var(--radius-pill);
+  background: transparent;
+  color: var(--text-muted);
+  font-family: var(--font-ui);
+  font-size: var(--tab-add-empty-font);
+  font-weight: 500;
+  cursor: pointer;
+  flex-shrink: 0;
+  transition:
+    background var(--dur-base) var(--ease-standard),
+    border-color var(--dur-base) var(--ease-standard),
+    color var(--dur-base) var(--ease-standard);
+}
+
+.led {
+  width: var(--led-size);
+  height: var(--led-size);
+  border-radius: 50%;
+  flex-shrink: 0;
+  background: var(--accent-down);
+  transition: background var(--dur-base) var(--ease-standard);
+}
+
+.led--lg {
+  width: var(--led-size-lg);
+  height: var(--led-size-lg);
+}
+
+.icon-tab-add,
+.icon-tab-add-empty {
+  width: var(--tab-add-icon-size);
+  height: var(--tab-add-icon-size);
+}
+
+.icon-crown {
+  width: var(--crown-icon-size);
+  height: var(--crown-icon-size);
+}
diff --git a/src/components/topbar/Topbar.tsx b/src/components/topbar/Topbar.tsx
index 6acf9aa..00805b9 100644
--- a/src/components/topbar/Topbar.tsx
+++ b/src/components/topbar/Topbar.tsx
@@ -1,10 +1,48 @@
 import { useEffect, useRef } from 'react';
 import { DSP, AppPage } from '../../types/types';
-import Tab from './Tab';
 import AnimatedLogo from '../../assets/icons/AnimatedLogo';
 import { PlusIcon } from '../../assets/icons/PlusIcon';
 import { CrownIcon } from '../../assets/icons/CrownIcon';
 
+import './Topbar.css';
+
+function Tab({
+  dsp,
+  active,
+  dimmed,
+  onSelect,
+  onRemove,
+}: {
+  dsp: DSP;
+  active: boolean;
+  dimmed: boolean;
+  onSelect: () => void;
+  onRemove: () => void;
+}) {
+  return (
+    <button
+      className={'tab' + (active ? ' tab--active' : '') + (dimmed ? ' tab--dimmed' : '')}
+      onClick={onSelect}
+    >
+      <span className={'led led--' + dsp.status} />
+      <span className="tab-name" title={dsp.name}>
+        {dsp.name}
+      </span>
+      <span
+        className="tab-close"
+        role="button"
+        aria-label={`Remove ${dsp.name}`}
+        onClick={(e) => {
+          e.stopPropagation();
+          onRemove();
+        }}
+      >
+        x
+      </span>
+    </button>
+  );
+}
+
 function TopBar({
   dsps,
   selected,
@@ -67,11 +105,11 @@ function TopBar({
       <div className="tabstrip-actions">
         {hasTabs ? (
           <button className="tab-add" aria-label="Add DSP" onClick={onAddClick}>
-            <PlusIcon width={14} height={14} />
+            <PlusIcon className="icon-tab-add" />
           </button>
         ) : (
           <button className="tab-add-empty" onClick={onAddClick}>
-            <PlusIcon width={14} height={14} />
+            <PlusIcon className="icon-tab-add-empty" />
             <span>Add DSP</span>
           </button>
         )}
@@ -86,7 +124,7 @@ function TopBar({
           setSelect(null);
         }}
       >
-        <CrownIcon width={18} height={18} />
+        <CrownIcon className="icon-crown" />
       </button>
     </header>
   );
diff --git a/src/pages/DspPage/DspPage.tsx b/src/pages/DspPage/DspPage.tsx
index 70967b0..f03d918 100644
--- a/src/pages/DspPage/DspPage.tsx
+++ b/src/pages/DspPage/DspPage.tsx
@@ -1,11 +1,11 @@
 import { useState } from 'react';
 import { DSP } from '../../types/types';
 import Sidebar from '../../components/Sidebar/Sidebar';
-import { InfoIcon, SlidersIcon } from '../../assets/icons/AudioIcons';
+import { InfoIcon, KnobGainIcon } from '../../assets/icons/AudioIcons';
 import ConnectionPanel from '../../components/dsp408/ConnectionSection/ConnectionSection';
 import GainSection from '../../components/dsp408/GainSection/GainSection';
 import { NotificationType } from '../../types/types';
-import './DspPage.css'
+import './DspPage.css';
 
 function DSPPage({
   dsp,
@@ -30,7 +30,7 @@ function DSPPage({
     {
       id: 'gain',
       label: 'Gain',
-      icon: <SlidersIcon />,
+      icon: <KnobGainIcon />,
     },
   ];
 
diff --git a/src/styles/App.css b/src/styles/App.css
index d3623d5..cfe718b 100644
--- a/src/styles/App.css
+++ b/src/styles/App.css
@@ -357,28 +357,6 @@ button:focus-visible,
 
 /* ---------- DSP panel ---------- */
 
-.panel-header {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  gap: var(--space-4);
-  margin-bottom: var(--space-6);
-}
-
-.panel-title {
-  margin: 0;
-  font-size: 18px;
-  font-weight: 600;
-}
-
-.panel-type {
-  margin-top: var(--space-1);
-  font-size: 12px;
-  color: var(--text-muted);
-  font-family: var(--font-mono);
-  letter-spacing: 0.03em;
-}
-
 .status-block {
   display: flex;
   align-items: center;
@@ -501,77 +479,3 @@ button:focus-visible,
   gap: 10px;
   margin-top: var(--space-2);
 }
-
-/* ---------- DSP detail: side rail + content ---------- */
-
-.dsp-detail {
-  display: flex;
-  align-items: flex-start;
-  gap: var(--space-5);
-  width: 100%;
-  max-width: 720px;
-}
-
-.dsp-subnav {
-  display: flex;
-  flex-direction: column;
-  gap: 2px;
-  flex: 0 0 168px;
-  padding: var(--space-2);
-  background: var(--bg-panel);
-  border: 1px solid var(--border-hairline);
-  border-radius: var(--radius-md);
-}
-
-.dsp-subnav-item {
-  display: flex;
-  align-items: center;
-  height: 34px;
-  padding: 0 var(--space-3);
-  border: none;
-  border-left: 2px solid transparent;
-  border-radius: var(--radius-sm);
-  background: transparent;
-  color: var(--text-muted);
-  font-family: var(--font-ui);
-  font-size: 13px;
-  text-align: left;
-  cursor: pointer;
-  transition:
-    background var(--dur-base) var(--ease-standard),
-    color var(--dur-base) var(--ease-standard),
-    border-color var(--dur-base) var(--ease-standard);
-}
-
-.dsp-subnav-item:hover {
-  background: var(--bg-raised);
-  color: var(--text-primary);
-}
-
-.dsp-subnav-item--active {
-  background: var(--bg-raised);
-  border-left-color: var(--accent-brand);
-  color: var(--text-primary);
-  font-weight: 500;
-}
-
-.dsp-subnav-content {
-  flex: 1 1 auto;
-  min-width: 0;
-}
-
-/* Let the panel card fill the available width next to the rail,
-   instead of capping out at 480px like it does standalone in .stage */
-.dsp-subnav-content .card {
-  max-width: none;
-  width: 100%;
-}
-
-/* ---------- Layout wrapper below the topbar ---------- */
-/* .app is already: display:flex; flex-direction:column; height:100vh;
-   this row just needs to fill the remaining space */
-.main-layout {
-  flex: 1;
-  display: flex;
-  min-height: 0; /* lets .stage's own overflow-y:auto do the scrolling */
-}
diff --git a/src/styles/variables.css b/src/styles/variables.css
index 43cc2d7..aefd81d 100644
--- a/src/styles/variables.css
+++ b/src/styles/variables.css
@@ -1,9 +1,37 @@
 @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');
 
 :root {
-  --header-height: 48px; /* matches .topbar's existing height */
-  --sidebar-width-collapsed: 56px;
-  --sidebar-width-expanded: 180px;
+  --header-height: 7vh;
+  --gain-section-height: 40vh;
+
+  --sidebar-width-collapsed: 6vh;
+  --sidebar-width-expanded: 22vh;
+
+  --sidebar-icon-size: 2vh;
+  --sidebar-item-size: 4.5vh;
+  --sidebar-toggle-size: 3vh;
+  --sidebar-label-size: 1.9vh;
+  --sidebar-item-gap: 1vh;
+  --sidebar-item-padding: 1vh;
+
+  --font-size-sm: 3vh;
+
+  --tab-height: 4vh;
+  --tab-width: 18vh;
+  --tab-font-size: 1.3vh;
+  --tab-close-size: 1.8vh;
+  --tab-close-font: 1.5vh;
+
+  --tab-add-size: 2.6vh;
+  --tab-add-empty-height: 3vh;
+  --tab-add-empty-font: 1.2vh;
+
+  --led-size: 0.8vh;
+  --led-size-lg: 1.2vh;
+
+  --crown-icon-size: 2.2vh;
+  --tab-add-icon-size: 1.6vh;
+  --logo-size: 18vh;
 
   /* ---------- Color ---------- */
   --bg-void: #0d0f12;
@@ -30,12 +58,12 @@
   --ease-in: cubic-bezier(0.4, 0, 1, 1);
 
   /* ---------- Spacing scale ---------- */
-  --space-1: 4px;
-  --space-2: 8px;
-  --space-3: 12px;
-  --space-4: 16px;
-  --space-5: 20px;
-  --space-6: 24px;
+  --space-1: 0.5vh;
+  --space-2: 1vh;
+  --space-3: 1.5vh;
+  --space-4: 2vh;
+  --space-5: 2.5vh;
+  --space-6: 3vh;
 
   /* ---------- Radius ---------- */
   --radius-sm: 6px;
@@ -54,11 +82,4 @@
   /* ---------- Animation ---------- */
   --transition-fast: 120ms;
   --transition-base: 180ms;
-
-  /* ---------- Component sizes ---------- */
-  --sidebar-item-size: 32px;
-  --sidebar-item-gap: 10px;
-  --sidebar-item-padding: 8px;
-
-  --sidebar-toggle-size: 24px;
 }