feat: add peq foor input

src/features/dsp408/dsp408.ts

@@ -15,8 +15,8 @@ import {
 } from './types';
 import { SetDsps, NotifyFn, updateDSP, setPollingPaused } from '../../dsp/dspShared';
 import { registerPollStopper } from '../../dsp/pollRegistry';
-import { defaultDSPState, defaultMeters } from './types';
-import { DELAY_RANGES } from './types';
+import { defaultDSPState, defaultMeters } from './defaults';
+import { DELAY_RANGES, PEQ_Q_RANGES } from './constants';
 
 type DSP408 = Extract<DSP, { type: 'DSP408' }>;
 
@@ -1325,20 +1325,40 @@ export function forDSP408(dsp: DSP408, setDsps: SetDsps, notify: NotifyFn) {
       bypass: boolean
     ): Promise<boolean> {
       const updatePeqBand = () => {
+        function convertPeqQ(value: number, from: PEQFilter, to: PEQFilter): number {
+          if (from === to) return value;
+
+          const [fromMin, fromMax] = PEQ_Q_RANGES[from];
+          const [toMin, toMax] = PEQ_Q_RANGES[to];
+
+          if (fromMax === fromMin) return toMin;
+
+          const ratio = (value - fromMin) / (fromMax - fromMin);
+
+          return toMin + ratio * (toMax - toMin);
+        }
+
         updateDSP(setDsps, dsp.id, (d) => {
           if (!d.state) return d;
 
           const cfg = d.state.current_config;
-          const peqBand = {
-            gain: gainDb,
-            frequency: freqHz,
-            q,
-            filter_type: filterType,
-            bypass,
-          };
 
           if ('Input' in channel) {
             const inputState = cfg.input_states[channel.Input];
+            const existingBand = inputState.peq_chain.bands[band];
+
+            const nextQ =
+              existingBand.filter_type !== filterType
+                ? convertPeqQ(existingBand.q, existingBand.filter_type, filterType)
+                : q;
+
+            const peqBand = {
+              gain: gainDb,
+              frequency: freqHz,
+              q: nextQ,
+              filter_type: filterType,
+              bypass,
+            };
 
             return {
               ...d,
@@ -1365,6 +1385,20 @@ export function forDSP408(dsp: DSP408, setDsps: SetDsps, notify: NotifyFn) {
           }
 
           const outputState = cfg.output_states[channel.Output];
+          const existingBand = outputState.peq_chain.bands[band];
+
+          const nextQ =
+            existingBand.filter_type !== filterType
+              ? convertPeqQ(existingBand.q, existingBand.filter_type, filterType)
+              : q;
+
+          const peqBand = {
+            gain: gainDb,
+            frequency: freqHz,
+            q: nextQ,
+            filter_type: filterType,
+            bypass,
+          };
 
           return {
             ...d,