Otamatone Emulator
- https://github.com/jeffkaufman/trackpad_synth
- https://github.com/mcourteaux/MultiTouch-Gestures-Java
- https://audioswiftapp.com/
- https://github.com/paulvollmer/MultitouchPadOsc
- https://github.com/mhuusko5/M5MultitouchSupport
- https://github.com/fajran/tongseng
- mac compatibility on other env.
- wow effect?