MIDI Jar is a tool box for musicians, learners, streamers, that want to route MIDI message between devices, and display a piano or chords while playing, and integrate it on a video or on a Twitch stream.

Basic MIDI signal routing in a single HTML file

Humanize those drum computers! – Cybo-Drummer is a 6 in / 6 out MIDI router/mapper for mapping drum triggers to drum computers