Ambisonic setup

Ok, so i've got tidalcycles running with 12 outputs from supercollider into an ambisonic setup on reaper. The pan on tidalcycles seems to spread the output too much, so a pan of 0 spreads across 6 channels of output. Is there a way of narrowing the spread of the output? Also if there are 12 channels of output, are they addressed as pan 0 to pan 11?

I've also noticed that at pan 0, channels 1 2 3 4 & 7 8 have audio. Is there some kind of panning logic applied to the pan command?

Have a read through this thread:

I think it will cover most of what you need

Thanks ! Most helpful. I was wondering back then how those options interacted with each other. The s.options.numOutputBusChannels= also makes a difference too.