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In Reply to: There appears to be a separate DSP/amp posted by Digi on April 29, 2002 at 14:19:50:
http://bimmer.roadfly.org/5series/messages/archive/msgsy1998w40/5213.html
See the post below for more links and info about the DSP and audio system.
Looking some of this over briefly, it looks as though the DSP and amplifier are one. I'll try to tap into the analog signal path(s) between the tuner/cassette and the DSP/amp. Injecting a line-level audio signal there while playing a blank cassette should produce the desired results. It worked great in my 2000 Suburban!
THANKS AGAIN FOR THE URLs!!