Is it doable to use a 9 channel player too ? (3 PSG, 6 YMZ). That would be what I really need.
My original idea was to use arkos tracker to make a 6 channel music and to make it 3 channels at a time.
But it's good that I can use Vortex tracker to make 6 channels.
Perhaps you can use vortex tracker and arkos tracker. Play them both at the same time. Alternatively, I am sure arkos tracker could be extended to 9 channels with some copy+paste.
Of course it will take more raster time because you now need to process 9 channels. Then send 6 to YMZ and 3 to PSG.
The main problem I see is to make it easy for the musician to make this music.