MIDI fingers is half visualizer and half controller. It uses the hands plugin for tracked fingertips, then mirrors those finger-to-thumb distances into Web MIDI control changes in JavaScript. The overlay on screen helps you see the same values you are sending to your synth or DAW.

The current mapping is 41-43 for selected left-hand fingers and 44-47 for selected right-hand fingers. It sends to the first available MIDI output.