Vintage Synth Repair

Okay, kids, I've just about wrapped up work on my Wurlitzer model 112
electric piano, so now I'm getting ready to grit my teeth and return to
work on a device that drove me nearly to madness about half a year ago:
my non-functioning Arp Omni.  So here's the basic synopsis of what I can
remember:

After a bit of simple work (mostly replacing the infamous leaky caps),
it powers up just fine.  All lights work.  No sound is produced, except
for a bit of "key click".  The filters, however, obviously work, as I
can hear these "key clicks" processed through the filters (i.e., I can
hear the frequency response change at the appropriate intervals).  All
keys obviously work as they can all produce this "key click".
Apparently the tone generator itself or something in its path is the
problem, and will not produce synth OR string sounds.  I can't remember
EVERYTHING I replaced in an attempt to produce sound, but I recall
replacing a few IC chips, transistors, capactitors.

So... any suggestions, kids?

BaM

--
Find out more about Rocket Park at the (subliminal banana) home page!
http://www.rocketparkmusic.com/