hi sandrob,
if you have the mod2 i could whip you together a constant phase invertor.
otherwise its just accomplished via a constant val bipolar set to -64 fed into a ring modulator being fed the audio signal you want to effect. -64 is out of phase, +64 is correct phase at 0 the signal disappears. anywhere in between the top and bottom range is something slightly out of phase.
made an effects patch recently which modulates the phase via this method.
still working on the patch, i'm finding effects patches quite a bit harder to make interesting.
oh yah, i've come across a device defex made awhile back mean for ms matrixing...
its called The Xenon CODEC
MS Encoder/Decoder, availble only on his site at
http://www.neutron7.com.
that should do.
best.