If, when the Empeg wasn't present, I wanted to turn on my car's amplifiers by applying voltage directly to the amp remote wire, what would be the best way to go about that without hurting anything?

Would it be a problem to just wire the ignition power, through a switch of course, directly to the blue wire?

If the Empeg were present and I accidentally left the switch "on", would that hurt the Empeg?

I'm thinking of doing a stunt whereby I have a secondary input for ipods and such that will work when the Empeg is not present. I'd send the ipod output through a stereo volume potentiometer and into a resistance mixer circuit into the front/rear lines to the amps.

I'm just investigating the idea for now, wondering what sorts of troubles I'd run into.