Add widget emit speed control for emitted audio

client/src/audio/itemEmitRuntime.ts

@@ -24,6 +24,15 @@ type EmitSpatialConfig = {
 
 const ITEM_EMIT_BASE_GAIN = 0.3;
 
+function resolveEmitPlaybackRate(raw: unknown): number {
+  const speed = Number(raw);
+  const clamped = Number.isFinite(speed) ? Math.max(0, Math.min(100, speed)) : 50;
+  if (clamped <= 50) {
+    return 0.5 + (clamped / 50) * 0.5;
+  }
+  return 1 + ((clamped - 50) / 50) * 1;
+}
+
 export class ItemEmitRuntime {
   private readonly outputs = new Map<string, EmitOutput>();
   private layerEnabled = true;
@@ -101,6 +110,7 @@ export class ItemEmitRuntime {
       const effect = normalizeRadioEffect(item.params.emitEffect);
       const effectValue = normalizeRadioEffectValue(item.params.emitEffectValue);
       const effectRuntime = connectEffectChain(audioCtx, effectInput, gain, effect, effectValue);
+      element.playbackRate = resolveEmitPlaybackRate(item.params.emitSpeed);
       if (this.audio.supportsStereoPanner()) {
         panner = audioCtx.createStereoPanner();
         gain.connect(panner).connect(audioCtx.destination);
@@ -138,6 +148,10 @@ export class ItemEmitRuntime {
         output.effect = effect;
         output.effectValue = effectValue;
       }
+      const nextPlaybackRate = resolveEmitPlaybackRate(item.params.emitSpeed);
+      if (Math.abs(output.element.playbackRate - nextPlaybackRate) > 0.001) {
+        output.element.playbackRate = nextPlaybackRate;
+      }
       const spatialConfig = this.getSpatialConfig(item);
       const mix = resolveSpatialMix({
         dx: item.x - playerPosition.x,

client/src/items/itemRegistry.ts

@@ -52,7 +52,7 @@ const DEFAULT_ITEM_TYPE_EDITABLE_PROPERTIES: Record<ItemType, string[]> = {
   dice: ['title', 'sides', 'number'],
   wheel: ['title', 'spaces'],
   clock: ['title', 'timeZone', 'use24Hour'],
-  widget: ['title', 'enabled', 'directional', 'facing', 'emitRange', 'emitVolume', 'emitEffect', 'emitEffectValue', 'useSound', 'emitSound'],
+  widget: ['title', 'enabled', 'directional', 'facing', 'emitRange', 'emitVolume', 'emitSpeed', 'emitEffect', 'emitEffectValue', 'useSound', 'emitSound'],
 };
 
 const DEFAULT_ITEM_TYPE_GLOBAL_PROPERTIES: Record<ItemType, Record<string, string | number | boolean>> = {
@@ -196,6 +196,7 @@ export function itemPropertyLabel(key: string): string {
   if (key === 'emitRange') return 'emit range';
   if (key === 'mediaVolume') return 'media volume';
   if (key === 'emitVolume') return 'emit volume';
+  if (key === 'emitSpeed') return 'emit speed';
   if (key === 'mediaChannel') return 'media channel';
   if (key === 'mediaEffect') return 'media effect';
   if (key === 'mediaEffectValue') return 'media effect value';

client/src/main.ts

@@ -753,6 +753,7 @@ function inferItemPropertyValueType(item: WorldItem, key: string): string | unde
     key === 'version' ||
     key === 'mediaVolume' ||
     key === 'emitVolume' ||
+    key === 'emitSpeed' ||
     key === 'mediaEffectValue' ||
     key === 'emitEffectValue' ||
     key === 'facing' ||
@@ -2158,6 +2159,14 @@ function handleItemPropertyEditModeInput(code: string, key: string, ctrlKey: boo
         return;
       }
       signaling.send({ type: 'item_update', itemId, params: { emitVolume: parsed.value } });
+    } else if (propertyKey === 'emitSpeed') {
+      const parsed = validateNumericItemPropertyInput(item, propertyKey, value, true);
+      if (!parsed.ok) {
+        updateStatus(parsed.message);
+        audio.sfxUiCancel();
+        return;
+      }
+      signaling.send({ type: 'item_update', itemId, params: { emitSpeed: parsed.value } });
     } else if (propertyKey === 'mediaEffect' || propertyKey === 'emitEffect') {
       const normalized = value.trim().toLowerCase() as EffectId;
       if (!EFFECT_IDS.has(normalized)) {