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I've been trying to build something like this last month or so. I was studying the source code of beepbox: https://github.com/johnnesky/beepbox
Does anyone know if there is an easier, higher level abstraction library for audio backend? The approach in beepbox is rather low level and you can make really interesting sounds, with the trade-off being your backend being really complex (literal sound waves).
I searched for MIDI output on web with sound font support but couldn't find anything helpful.
You might try wasgen, which I maintain. Basically you pass it an object that describes your audio graph, and a frequency/duration/volume, and it creates/disposes all the audio nodes.
https://github.com/andyhall/wasgen
Making the sound program objects isn't trivial if you're unfamiliar with low-level audio, but the live demo has examples for all MIDI instruments: https://andyhall.github.io/wasgen/
Thanks for pointing this out! I've noticed that too, but haven't gotten around to fixing it. It's helpful to hear that it's problematic for other people. I've opened this ticket to track progress on the issue: https://github.com/seancolsen/octave-compass/issues/80 Pull requests welcome! There are some notes in there pointing others to the relevant part of the code if anyone else wants to take a stab at fixing!