strudel/docs/dist/tune.js

import Tune from "./tunejs.js";
import {Pattern} from "../_snowpack/link/strudel.js";
Pattern.prototype._tune = function(scale, tonic = 220) {
  const tune = new Tune();
  if (!tune.isValidScale(scale)) {
    throw new Error('not a valid tune.js scale name: "' + scale + '". See http://abbernie.github.io/tune/scales.html');
  }
  tune.loadScale(scale);
  tune.tonicize(tonic);
  return this._asNumber()._withEvent((event) => {
    return event.withValue(() => tune.note(event.value)).setContext({...event.context, type: "frequency"});
  });
};
Pattern.prototype.define("tune", (scale, pat) => pat.tune(scale), {composable: true, patternified: true});