hi, just a suggestion: maybe it's possible to do the gate with analog device ssm2404 quad audio switch.there are really "clickless", i've "breadboard" two of them and tested them with a DOUT (with no resistor) with success: as you can see, the implementation is really simple: one stripboard, one chip and some resistors (and maybe some socket if you don't want it looks like mine ;) ) but maybe the "clickless" fonction will "break" the dynamic of the attack....from my side, my hear find they are enough fast to react...