L5 call audio quality

[JR-Fi]

Just so, that everyone can find it from here, see @Loki’s more permanent solution:

@Loki

I spent some more time on it and have come up with a “set and forget” solution which allows for USB headsets to be the simple plug ‘n’ play devices they’re supposed to be while being able to be used by Calls without having their input volumes messed around with.