Replied to this a half hour ago via email and it never showed up, so I'll try again directly from the group conversation. Maybe you will get two of these. Maybe nobody will ever see it. Isn't Yahoo fun?
He said C#0, A0, F1, C#1, A2, F3, C#4, G4, A4,
A#4, which would be every 8 notes, except for the G4 and A#4. The G4 and A#4 may
just be bad contacts. The others (any C#, A, F) is every eighth note and could
indicate a bad wire to the keyboard, or a bad trace or diode on the matrix
circuit board under the keys where the contacts are, or a problem on the KLM-366
between the keyboard connector (CN04) and the chips it connects to, or a problem
on one of those chips. That is quite a few possibilities. I guess the real clues
would be the fact that the arpeggiator does recognize that the key has been
pressed even though it makes no sound when the arpeggiator is not engaged, and
the strange statement that there is a “hanging note” when using Chord Memory.
More details are needed on that. For the wiring to the keyboard, you would need
to carefully inspect a disassembled key contact board to see which wire in the
matrix is connected to all C#, A and F keys.
Don Backshall