It might be worth checking the amp with line out from another device. Leave the switching line hooked to the empeg & just change input leads. That'd at least show if the amp is working, there've been a bunch of posts of strange problems with amps, internal grounds being poorly connected. You never know.

Aux in on the front panel? Use the amps luke, use the amps...

-Zeke

goin' skiing. Oh yeah.