Out of curiosity... the maximum audio-hardware polyphony of Megadrive should be 9 channels (6 FM channels, YM2612, and 3 PSG channels, SN76496)
The PSG has 3 tones generators and 1 noise generator, but this latter haven't a dedicated channel, so it must use a tone generator channel as output.
Am I right?
![confused :S](https://neo-source.com/Smileys/default/huh.gif)