Turbo Duo Sound Circuits

From Dean Dragoli <xxxxxx@neo-geo.com>
Date
OK folks, I'm looking into the cause of the sound problems that crop up 
with Turbo Duo systems.

First off, does anyone know the cause?  I suspect it is a bad IC or cap 
in the audio circuit caused by overheating.  But I'm having a hell of a 
time locating the offending circuit or part.  If anyone can tell me at 
least which IC is the main sound processor, that would help a lot.

Also, I've asked before and only gotten one response so I'll ask again. 
  Any Duo-R or Duo-RX owners have sound issues?  I believe the problem 
is the location of the heat sink in the Turbo/PCE Duo, a problem that 
may not be present in the R and RX.