Thanks :)

I've made a couple of music apps over the years, including one of the oldest JS music apps on the web, that also does URL encoding: https://pointersgonewild.com/2012/04/23/musictoy-music-made-...

But also generally, I was looking at other web-based drum machines, and most of them are either super basic, full of ads, or they have bad cryptic UIs. I also wanted to design a more advanced sequencer with a timeline that would have an intuitive UI to work with.

I built a sequencer in NoiseCraft, a browser-based music programming language I built a few years ago (e.g. https://noisecraft.app/101), but you can't chain pattern in this sequencer, which makes it harder to create longer piece (though people have found workarounds).