I'm trying to do 'mixerctl -w inputs.dac--' on a Thinkpad with an
azalia sound card.  However, it generally doesn't work; it keeps the
value where it was.  ++ does work; increments alternate between 6 and
7.  I assume that this is something wrong with the azalia driver itself.

		--Steve Bellovin, http://www.cs.columbia.edu/~smb