This program listens to a MIDI IN port and displays incoming MIDI messages on multiple graphic keyboards. Please contact Jeff Koftinoff for the free source code. Compiling the source code requires the free Cygwin GNU Tools For Windows.

You may find this program most useful in conjunction with HUBI'S Loopback MIDI Driver, which with proper set up will allow MIDI Key Viewer to show you what your MIDI Sequencer is playing.