What do I need to know about MIDI to use the trapKAT? ALL YOU REALLY NEED TO KNOW TO GET GOING WITH MIDI: 1. Match the Channel your trapKAT is sending on with the Channel your sound source is set to receive on. 2. Match the Note numbers on your trapKAT Pads to the sounds you want your sound source to play. 3. Use Program Changes to select other groups of drum sounds or other pitched sounds. See p.31-34 in the trapKAT manual.