Game Gear stereo extension

When a byte is written to port 0x06 on the Game Gear, the PSG output is affected as follows:

BitChannelSide
00Right
11Right
22Right
33Right
40Left
51Left
62Left
73Left

If a bit is set, the corresponding channel is output to the corresponding side. So, 0xff outputs all channels to all sides, 0xf0 outputs to the left side only, etc.




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