I just installed redhat 7.2 and my initial user of kde took over
the soundcard. then the next user could not access it (got error of
access /dev/dsp - "permission denied" setting device to /dev/null.
then i went and chmoded /dev/dsp from crw----------- to crw-rw-rw. now
how to reset the dsound device from /dev/null to /dev/dsp for other