Discussion about the Korg PolySix synthesizer

The Polysix uses SRAM to store program data (a little old 5514). Does 
anyone know if this SRAM is used by the system for anything else? If 
it isn't, then it would be pretty easy to devise some very simple 
circuitry to expand the RAM capacity, and allow for the storage of 
more programs. One could just use a larger RAM, and switch the upper 
address lines...

Thanks,
fargap