Is the amp triggered on by a +12 volt or other low voltage DC input signal? (that is typically how it works). What you can do is connect a small power supply (such as a wall-wart DC power pack) to the amps' trigger input via appropriate connectors. Plug the power pack into whatever device your are energizing via that 'single switch'. Now when you energize the rig, the DC will trigger on the power amp.
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