Sega Genesis VGM: Split SN76489-like PSG into channels?

I wrote a program called vgmsplit, to perform multi-channel rendering, by rendering the same thing many times but muting all but 1 channel each time (unfortunately a bit slow, but OK unless you enable Nuked). It contains the following code:

for (int channel = 0; channel < gme_voice_count(emu); channel++) {
    writeChannel(channel);
}

where writeChannel is vgmsplit-specific code.

Sadly when playing a Sega Genesis .vgm file, all PSG outputs are outputted to a single wav, where gme_voice_name(emu, channel) == "PSG".

Is it possible to split Genesis PSG into 3 square and 1 noise channel?

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