Dave, I'll make a short sample song for your organ in Wurlitzer 125
style.  Please send me a description of the organ scale, and the
mapping you require, from MIDI file format to your instrument.  How
many "keys" are played in the 125 scale?  The MIDI-file numbering
for the 88-note piano scale is notes 12A-1 to 108C7, where Middle-C
is 60C3.  (Some systems define Middle-C as 60C5.)

-- Robbie Rhodes