the launchpad will respond to regular midi data. for example if you press the top right button (on the grid, not the circular button) it will send out note 0 at 127 velocity. if you send note 0 from max back to the launch pad, it will light the light… what color it lights depends on the velocity. 15=red 60=green etc. There’s a pdf file available from novation that details all of the midi messages the launchpad can receive.