do as much autodetection as possible, giveing the nicest sound possible
May need special handing for old cards that can only do mono at 44100,
but can do stereo at 22050 (eg sbpro). Depends on how alsa handles
these. It is prefereable to have 22050 stereo over 44100 mono.
common/snd_dma.c:
fixed passing structure instead of address of structure to Q_memset.
