Karplus strong generator

src/lib/audio/engines/registry.ts

@@ -7,6 +7,7 @@ import { NoiseDrum } from './NoiseDrum';
 import { Ring } from './Ring';
 import { Sample } from './Sample';
 import { Input } from './Input';
+import { KarplusStrong } from './KarplusStrong';
 
 export const engines: SynthEngine[] = [
   new Sample(),
@@ -17,4 +18,5 @@ export const engines: SynthEngine[] = [
   new ZzfxEngine(),
   new NoiseDrum(),
   new Ring(),
+  new KarplusStrong(),
 ];