A Studio in Liverpool bought a Behringer Valve Amp which featured a valve visible in the centre of the control panel. It glowed expensively!!

Unfortunately it was not actually connected to the audio circuitry at all! It simply drew power and lit up!

I agree with Mooh & others - the best acoustic processor is a good microphone.

Internal Pickups, Internal Pre amps & graphic EQs - don't even come near to the clarity of a good mike.