In reply to:

Hmm, I am starting to wonder if perhaps this is not something the Empeg people or one of us should build something for.

Absolutely! There is so much possibility with the empeg. It's a general purpose computer with a microphone input, moderately flexible hardware DSP, infinitely flexible software DSP, and plenty of processing power. There is a world of possibilities for auto calibration in both the frequency and time domains. I'm sure Empeg has thought down these lines though it's not easy to do correctly.

-Dylan