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Thank you, Rob,  One quick question before I try your suggestion
[070419 MMDigest].  When I connect my MIDI cable to the "PD Data In"
input to the PianoCD, nothing happens.  The only time I can get any
movement of the keys is to connect to the "MIDI-In" on the long box
under the center of the piano (which I believe contains the key
drivers).  Will making an adjustment to the PianoCD control unit
have any effect on MIDI that is played directly into the driver box?

Should it be possible to connect MIDI directly into the "PD Data In"
connection on the PianoCD control box?  If so, do you have any idea
what I might be doing wrong?

Thanks,
Gary Pratt