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.

Note however that this only affects the headphone output. The built-in speaker is unaffected; this means that

  1. One-sided sounds will be relatively louder on the speaker than on headphones
  2. If a channel is set to mute both sides, this has no effect on the speaker. Thus, don't use this to mute the sound.



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