Yes, sorry I'm not big on synth language. I have been using the word "voice" for years. With my Prophet 12 (Cassandra) I treat parts A and B as components of an overall voice which I output to 2 stereo volume pedals allowing me to alter the relative balance of volume between the parts. One of the things I sent to the two effect pedals (same type as the volume pedals as the Boss ones do both volume or expression) is panning changes so parts of the voices are (sometimes) mobile between 4 channels (AL,AR,BL,BR).
I don't record to computer - I grew up with mono tape recorders in the 70s and prefer a dedicated digital multitrack recorder with no pesky compression. The Akai multitrack (Maurice) has a stereo effect send so I output the four synth channels from the Akai's main outputs plus the effect sends - to 4 powered speakers. Ideally I would like 2 speakers in front L+R one behind and one overhead in the Michael Gerzon style, but I lack the money and infrastructure and am too old (61) to be lugging all that gear around.
I took this equipment out on my Pilgrimage project 3 years ago to 7 Ancient churches and a Cathedral (I am not religious, but those places had fantastic acoustics) and made a series of 4 channel recordings, but sadly there is no commonly used Quad format, so I mostly release stereo mixes.
It gets complicated - because I was improvising to a time based score I can mix together parts of different performances from different churches - this is one of my favourites -
https://soundcloud.com/andy-15-3/beuno-mary-goes-canterburyFor a (50 min) whole live performance (if you have the patience of a saint!)
https://soundcloud.com/andy-15-3/01-st-beunos-clynnog-fawr