add sfumato soundfont player

packages/soundfonts/sfumato.mjs

@@ -0,0 +1,16 @@
+import { Pattern } from '@strudel.cycles/core';
+import { /* loadSoundfont, */ startPresetNote } from 'sfumato';
+
+// TODO: find way to cache loadSoundfont
+
+Pattern.prototype.soundfont = function (sf, n = 0) {
+  return this.onTrigger((t, h, ct) => {
+    const ctx = getAudioContext();
+    const note = getPlayableNoteValue(h);
+    const preset = sf.presets[n % sf.presets.length];
+    const deadline = ctx.currentTime + t - ct;
+    const args = [ctx, preset, toMidi(note), deadline];
+    const stop = startPresetNote(...args);
+    stop(deadline + h.duration);
+  });
+};