Sequential circuits samplers

<< lots of schematics to cope with >>

I almost forgot- wine country told me a few things to try before confirming 
my suspicion that my 2000's keyboard controller chip was fried. what they 
didn't tell me- and they knew that I deal with electronics for a living- was 
that a number of other, less rare components might be the cause of the 
problem (stuck notes, since you ask).
 
I'd gone way past the cleaning of the rubber pads under the keys by this 
time, and the contacts all looked ok, though this had been a hire machine (ex 
music lab in 1991, as-seen, with a busted floppy drive, £350. I found the 
receipt in the manual. I had a broken thumb when I collected it.....). 
so I exchanged a few e-mails with them, but now I think about it, I reckon 
the guy who answers this correspondence was used to giving bad news to people 
looking for curtis chips for their p5's. I didn't even bother them when my 
pro-1 blew up, I just bought a new filter chip from tim wallhead.
so anyway, I'm going to have a poke around and see if it comes to life. has 
anyone else had intermittent, random stuck notes? what's the mixture of 
2000's and 2002's out there?

duncan/r.m.i.