[gvido]

I've spent most of 2020 building something similar. Now I just wish I had a landing page ready so I can plug it here instead of over engineering the app itself, but oh well :)

Anyway, what I'm building is meant more for the repetitive kinds of electronic music, but I solved the problem by just making it work like a shared loop pedal that records up to 16 measures of audio.

Everyone works asynchronously and can add or remove audio on their own time, but loops get synced to other players as they get recorded.

Best part? You can do cool stuff with browsers nowadays (even record uncompressed audio). So it just needs a web browser.