You could check to see if gnome-audio is installed.
Code:
ls /var/log/packages/ |grep "gnome-audio"
You can download it here if you don't have it.
http://slackware.com/pb/download.php...2.0.0-noarch-1
You can check to see if sound is working by: playing mp3 files, playing movies, playing DVDs, playing CDs, etc.
You can check that you have the sound server enabled:
Applications -> Desktop Preferences -> Sound (Check both boxes under "General")
You can make sure that your volume is turned up and unmuted
Applications -> Multimedia -> Volume Control