Thanks, that's awesome. I'm familiar with both CSound and Pd, but have not
gone into advanced techniques which, I surmise, this would require. In fact,
they were the next apps in my TODO if there really was to be no ready-made
solution. I've read a paper where Ambisonics and 5.1 were discussed with the
help of CSound and some fundamental formulae; have to look for it again so
back to the desk for me!