The KeyMaster is realtime MIDI performance software. "Patches" send
MIDI data like program changes and route MIDI data through filters
that can transpose, filter, limit note ranges, split, layer, and
otherwise munge the MIDI data.

For lots more info, see the file KeyMaster/help/index.html.

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The KeyMaster is by Jim Menard (jimm@io.com). It is Copyright 1995, 1996.