feedback + killswitch
That's the most utterly ridiculous modding idea I've ever heard...

...and so, I wish you the best of luck! Try wiring in a killswitch for easier results, otherwise there's a whole lot of complex signal generation and switching involved.
The circuitry would probably end up being highly complicated. Just go for a killswitch, and even though it would pretty much be the reverse of a telegraph, an audience would still probably think its cool.