Use launchpad mini as a OSC mixer/pad
mixer button will switch Mixer mode and Pad mode.
In Mixer mode, Launchpad works as 8-track mixer.
In Pad mode, Launchpad works as a MIDI pad, but it also emits OSC messages.
When you hit keys while holding one of the rightmost key down, the note is Held; It toggles the note's on/off.