the factory HU is going into the Empeg aux in. The empeg is now the master. The empeg is going out to an amp. If i want to listen to a cd, cassette, or the radio for some strange reason, I just switch the empeg to auxillary mode and turn on the factory HU.

A line-level converter was needed as well.
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50 Gig MK2 feat. over 7445 songs, 865 albums by 400 artists for 25 days of easy listening