Not sure if you happen upon a late reply, but I took some of your suggestions and did a v0.3: https://htmlpreview.github.io/?https://github.com/titzer/RiffHoun

Not sure if you happen upon a late reply, but I took some of your suggestions and did a v0.3: https://htmlpreview.github.io/?https://github.com/titzer/RiffHound/blob/main/webui/voice/v0.3.html https://htmlpreview.github.io/?https://github.com/titzer/Rif... It has the horizontal keyboard, highlighting of played notes, and MIDI input. tested with WebMIDI on Firefox and it was a little squirrely but got it to work.