[Jack[_11_]]

Jack wrote:
Well... after switching channels between the push button input selector
board and the tape monitor board, the bad channel switches from left to
right. This indicates to me that push button switches are the problem.
However, when I use the tape playback inputs on the back of the unit and
flip the appropriate tape monitor flip switch, the problem continues.
The tape monitor switch switches on the tape playback jacks and switches
off all input from the pushbutton switches. I will have to look at the
schematics and try to puzzle out this behavior.

Okay, I totally disconnected the signal wires going from the pushbutton
switch circuit board to the tape monitor switch circuit board and I am
playing from the computer through the tape play back jacks. Both
channels are playing fine at the moment, but being that the problem is
intermittent without any way to induce it (that I know of) I will just
have to wait a see again.