[cyberferret]

Nice work! Although from my experience with audio programming in the browser, setInterval() is always fraught with timing danger and inconsistencies.

Have you considered using WebAudio's streaming functionality to tighten up the timing to something more rock solid? Probably a bit more setup in the first part, but for a drum machine especially, you get much better control over timing and playback note length.

I wrote an Ionic specific example of using the browser's WebAudio functionality to write a metronome app here: https://www.airpair.com/ionic-framework/posts/using-web-audi...