A FB is a bit excessive for that.
Just tap an ignition-controlled circuit.
If timing of the amp power-on is an issue use a simple delay circuit.
i have put together alpha release of a fusion Brain web interface
be gentle its alpha and it should work fine with androids ....i recommend http://www.aprelium.com/abyssws/ to run it and i also recommend you use visual studio 2010 to modify it to your likings
as for mono i dont follow its progress but abyss runs great with wine