Wow! This looks very extensive, and could be fun to use either for composition or for live performance. Unfortunately I’m unable to get MIDI to work in either Firefox or Chromium, even when running it outside the iframe. It also took me a while to figure out that I had to assign a channel to a block in order for anything to play. I think it would be nice to either have some examples to play with, or a tutorial or guide, in addition to the help screen.
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This is all really helpful, thank you! It might be that you don't have any kind of MIDI loopback set up, which I should highlight better in the how-to. Otherwise the problem might be another browser / WebMIDI quirk that I haven't caught yet. I also agree about tutorials, I'm hoping to have some interactive examples.