I've uploaded version 2 of MatrixMixerEmulator to the FTP server's incoming folder and also posted it at
http://www.geocities.com/ursamtl.
This updates the entire signal path to L, R, C, LFE, Ls, Rs as per ITU standards. It's designed to work with Kelly Industries Bass Manager v0.5 and SIR 1.005.
I've also replaced the dummy SIR with a native Plogue delay line set to 8960 samples as per SIR 1.005 specs. I haven't tested it, but I imagine this will be less CPU and/or memory intensive than creating an extra instance of SIR just to compensate for the delay.
Thanks for the feedback.
Ursa