How to redirect sound ?

1. redirect sound card redirected to /dev/null

I just installed redhat 7.2 and my initial user of kde took over
ownership of
the soundcard. then the next user could not access it (got error of
"could not
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
users?
thanks
Mitchell Laks

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