I used a switch made by Sony and triggered by the Empeg's Amp power line. My install only called for 2 channels, but they may have a 4-channel version, too.
Sorry, I forgot the model number. I'll try to find out.
Jason

_~= Dearing =~_
"WAY too happy about having #99."
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_~= Dearing =~_
Gettin' back into it thanks to slimrio!