1import { Pattern, noteToMidi, valueToMidi } from '@strudel/core';
2
3const maxPan = noteToMidi('C8');
4const panwidth = (pan, width) => pan * width + (1 - width) / 2;
5
6Pattern.prototype.piano = function () {
7  return this.clip(1)
8    .s('piano')
9    .release(0.1)
10    .fmap((value) => {
11      const midi = valueToMidi(value);
12      // pan by pitch
13      const pan = panwidth(Math.min(Math.round(midi) / maxPan, 1), 0.5);
14      return { ...value, pan: (value.pan || 1) * pan };
15    });
16};