c) Install an Empeg mod chip, available from www.3mp3gm0dch1pz.com
Hmmm... there seems to be a problem with that link -- I get a server not found error.

But I think Crutchfield carries them...
d) Call Tony Fabris at home and ask him how he does it.
Aha! I am one of the few human beings in the known universe who actually knows Tony Fabris' home phone number. It's 530-432-[censored]. But maybe I could be bribed into revealing it. Just attach your request to the back of an a/d/s P850.2 amplifier, and I'll see what I can do.
tanstaafl.