The only bits of information i've seen was here: http://www.smspower.org/Development/SN76489
There's brief information about Game Gear stereo extension through a port but this probably doesn't apply to the NGP.
Ok, i understood (sorry for the trouble): you have to write on both volumes registers to center the output, i think some pre-calculated left/right volumes tables would give stereo effect.
There's brief information about Game Gear stereo extension through a port but this probably doesn't apply to the NGP.
Ok, i understood (sorry for the trouble): you have to write on both volumes registers to center the output, i think some pre-calculated left/right volumes tables would give stereo effect.