Unpleasant audio problem which produces a nasty click every couple of
seconds.  Shows up while using ALSA output plug-in.  Goes away when
using OSS, even though it's OSS emulated by ALSA.

I really should have checked it out with some other ALSA playback: but
I couldnt figure out how to select the device in aplay and everything
else seemed to complicated, sorry...  I could do more to chase it, if
it really is otherwise unknown.