• Objects and visualisation software for dealing with spatialisation and ambisonics.
• Luigi Castelli has made objects for dealing with virtual analog bandlimited waveform generators and a quadraphonic panner and crossfader.
• RTcmix~ is a Max encapsulation of RTcmix. Brad garton has been plugging it the best he can at the Max mailing list lately. I took a quick look at it yesterday and it seems to be a very powerful tool well worth checking out.
• CMJ vol 28/1 contains two articles on banded waveguides. The DSP techniques are implemented in Max and can be downloaded here.