You and the guy who wanted 5.1 support can have an MMA octagon fight and we'll implement the survivor's choice of audio output ;-)
Seriously, MAME generally emulates the PCB, not the cabinet. To the extent that we emulate a cabinet, it's usually the fullest featured one the game can support, which always means stereo for Neo Geo. And as has been noted, Windows lets you force global mono, which is a good choice for using a J-PAC or whatnot.
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