Source "Note velocity"

This source reacts to incoming MIDI note-on and note-off messages. The higher the velocity of the incoming note-on message, the higher the absolute control value. Note-off messages are always translated to 0%, even if there’s a note-off velocity.

Note menu

Optionally restricts this source to messages with a certain note number (note numbers represent keys on the MIDI keyboard, e.g. 60 corresponds to C4).