fix: do not prebake in tests

+ pull piano function to separate file for tests

test/runtime.mjs

@@ -29,7 +29,7 @@ import '@strudel.cycles/xen/xen.mjs';
 // import '@strudel.cycles/webaudio/webaudio.mjs';
 // import '@strudel.cycles/serial/serial.mjs';
 // import controls from '@strudel.cycles/core/controls.mjs';
-import '../website/src/repl/prebake';
+import '../website/src/repl/piano';
 
 class MockedNode {
   chain() {

website/src/repl/piano.mjs

@@ -0,0 +1,16 @@
+import { Pattern, noteToMidi, valueToMidi } from '@strudel.cycles/core';
+
+const maxPan = noteToMidi('C8');
+const panwidth = (pan, width) => pan * width + (1 - width) / 2;
+
+Pattern.prototype.piano = function () {
+  return this.clip(1)
+    .s('piano')
+    .release(0.1)
+    .fmap((value) => {
+      const midi = valueToMidi(value);
+      // pan by pitch
+      const pan = panwidth(Math.min(Math.round(midi) / maxPan, 1), 0.5);
+      return { ...value, pan: (value.pan || 1) * pan };
+    });
+};

website/src/repl/prebake.mjs

@@ -1,6 +1,7 @@
 import { Pattern, noteToMidi, valueToMidi } from '@strudel.cycles/core';
 import { registerSoundfonts } from '@strudel.cycles/soundfonts';
 import { registerSynthSounds, samples } from '@strudel.cycles/webaudio';
+import './piano.mjs';
 
 export async function prebake() {
   // https://archive.org/details/SalamanderGrandPianoV3