I think that's why tiido basically ripped his out. I think the noise is not really being picked up by the YM2612 because those chips are pretty solid and are found in many many expensive keyboards of the 80s - i think its actually the CXA-1034 or the CXA-1145 that's the culprit. I also tried to isolate the YM2612's power supply as well but i failed and then ran into some monetary issues - it was hella difficult but i probably went about it the wrong way. I forgot to mention I actually replaced the huge cap in the wall wart too. The FM chips need really amazing amplifiers with very accurate capacitor filtering. It's much more apparent on an FM machine than on the NES' 2A03 because those don't actually need an amplifier for line level on a mixer. A lot of the complaints with noise on the Genesis come from electrolytic capacitor drain over time so you start to hear unwanted AC noise, VDP noise, and general tone harshness. I know that from modding tons of Boss pedals they make a great product and overtime ship shittier and shittier parts inside to cut costs and make a more profit.
its probably the horrible components the units shipped with. After reading this article i think the problem with the audio output is not really the original schematic.
Why not replace the caps in the audio section with some really hi-fi stuff: Like some Black Gate or Elna Silmic caps. I bought a cap kit from Jameco but after reading about HIFI audio amplifiers I had another thought. you just don't want to go down in volatge - up is fine. When you replace the caps - the voltages do not matter so much. If you're looking to replace the caps you will need: On the High Definition Graphics model one there is a dedicated YM2612 and for some reason the PSG master system chip sounds way better. Both the model 2 and 3 have ASIC versions of the YM2612 which means you won't see the actual chips on the board and I think the sound suffers because of it. I might as well have been using a really accurate emulator. That was basically my gripe with both the CCAM and the model 3. There is definitely more bass and the thing doesn't sound computery or digital. I remeber having a model one and loving playing it with my headphones on when i was like 12. I have to admit - there is a little more signal to noise ratio but overall the sound is much fuller. Recently, I bought a good High Definition Graphics model (from madgearstore) and did a full electrolytic capacitor replacement. It's also possible to stereo mod the model 3. I used the Crystal Clear Audio mod from tiido at first, then i switched to the unmodded model 3 which was a bit tighter and cleaner sounding (didn't matter that it was mono because i was using TFM - which didn't support panning). I have tried just about every model of the Genesis looking for the best audio.
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