For the 15th episode of Fat Man and Circuit Girl I build a C64 with a secondary SID with a FPGA bridge between the on board SID and the secondary SID. This allowed me to intercept writes and add or subtract a constant from the secondary SIDs notes being played. The result was a very nice sounding stereo output with slightly different sound from each channel.
FPGA Bridged Dual C64 SID Shown During FM&CG15
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