Well, the tuner module had a kit available from PCA. He's the most qualified to give you tips and tricks (if he's got the time on his hands).

Curious what kinds of devices? The obvious ones, such as a digital satellite tuner, wouldn't be supported by the empeg's front-panel software ("98.5 FM" doesn't have a Sirius/XM equivalent), and besides that stuff would work better plugged into the empeg's Aux port anyway.

In fact, without control software running on the empeg's front panel, I can't offhand think of anything that would work better on the tuner plug than it would work on the Aux plugs. So, really curious what you've got in mind.