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Esoteric language indeed!

Is there a way to load an example? I can't figure out how to get anything to work.

Inside the repo there are examples that help to understand how it works: https://git.sr.ht/~rabbits/orca/tree/master/examples

My browser doesn't have a MIDI out, so I don't understand how that's meant to work.

Chromium-based browsers only at the moment.