Did you create the user 'mpd'? If so, is 'mpd' a member of the audio group? If you created the user 'mpd' using Slackware's adduser shell script, you're prompted thusly:
Quote:
Press ENTER to continue without adding any additional groups
Or press the UP arrow to add/select/edit additional groups
: audio cdrom floppy plugdev video
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If you missed that part, then add user 'mpd' to those groups and see what happens.
I have a wee bit of unsolicited (and perhaps contentious) advice: I re-read your initial post and noticed that you mentioned sudo. Sudo is not set up in Slackware, by default, as it is in the 'buntu's, and others.... There are very compelling security *thoughts* as to the wisdom of seemingly unfettered use of sudo. IMNSHO, friends don't let friends use sudo. If you must perform a task as root, then become root, don't fake it.
edit, to elaborate slightly, I'm addressing the use of sudo on a personal system, established by default, as opposed to being established by an administrator....
cheers,