You can't play through your soundcard when you're not root, is that what you're saying?
Add your own username to the audio group. As root, edit /etc/group. Look for the line that begins with "audio:". It probably looks something like this:
Just append your username to the end of that line:
audio:x:29:jason (or whatever your login is)
Save and exit. Log out and log in again and try playing back some music.
If it still doesn't work, try doing chmod g+rw /dev/dsp /dev/dsp0 /dev/mixer
as root, then try again.