Dear Maintainer,

My laptop has a built-in hardware soundcard and also a USB device. Due
to variations in boot order it's unreliable which one appears in the
available mixers as `hw:0` vs `hw:1`. Because of this, having the
"Master" vollume from `hw:0` enabled, half the time it doesn't do
anything useful.

It would be useful if, rather than mapping the hardware based on simply
its index ID, it could be mapped by its interface name - the two names
are reliable that way.