Add a pitch option for interval-sources

src/sources/IntervalSource.ts

@@ -1,9 +1,12 @@
 import { Source } from "./Source";
-import { exposedRange, context } from "../audio";
+import { exposedNumber, exposedRange, context } from "../audio";
 
 export class IntervalSource extends Source {
   kind = "Interval";
 
+  @exposedNumber("Pitch", 0.25, 4)
+  public pitch = 1;
+
   @exposedRange("Interval", 0.25, 30)
   public interval: [number, number] = [1, 5];
 
@@ -55,6 +58,7 @@ export class IntervalSource extends Source {
         node.connect(pan);
         pan.connect(this.gain);
 
+        node.playbackRate.value = this.pitch;
         node.start();
 
         node.onended = () => {