If you listen, you can hear how I've split the channels. My options for each were hard-left, center, or hard-right, with the following exception:
For some reason, pairing the 2A03 Triangle with a Square Wave produced a buzz in the Triangle. I fixed this by placing the Triangle in the center.
Don't know why or how, but it fixed the buzzing.
Ideally we would have someone who knows what they are doing implement configurable channel panning in an accurate plugin. Apparently those people aren't interested.
That's the one I tried. It's okay, but it's not a plugin (inconvenient). I notice a click when starting a song. The panning sliders aren't very wide, so it's difficult to fine-tune. The N106 is a little smoother, but I can't say whether it's more or less accurate because I don't know how the N106 is supposed to sound.