For ambisonics, I have been using the udos by Martin Neukom:
[
Ambisonics User Defined Opcodes for Csound
lib.umich.edu
](https://quod.lib.umich.edu/i/icmc/bbp2372.2014.126/1)
If you get a nice ambisonic playback in, say Reaper, you can render via plugins from IEM and others to an Atmos speaker layout, whatever you have, via Allrad.
Reaper cheap, Atmos not so much.
Would be great to have IEM stuff in Csound. At least, the Neukom stuff…
James Croson