Subwoofer crossover

I’d like to see support that enables you to use a smart phone to do a room sweep [act as a basic audio mic] and to set a subwoofer crossover for a 2.1 and 5.1 system.

This would probably be a combination of hardware and software, but a cool to have feature.

Adam, sure this is not 2 lines of code! Good idea, btw!