It's not the only deck with an aux button on the front... My JVC CD/MD head unit has such a button, and I run the empeg through the line in's with no problems (and no grounding lead noise etc either... =)
However, as I hardly listen to MD in the car anymore (unless I'm leaving the empeg at home) it's become little more than an expensive volume control.. =)

Jazz
(List 112, S/N 00030, 4 gig blue)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)