Type cat /proc/pci and see if you can find your soundcard. I also experience that sound via xmms is not that perfect. Meaby trying a different output plugin can improve sound (ctrl + v).
Ok, i know there have been posts about the AC97 sound card but mine is more of a quality issue.
I used windows to listen to a song that has abit of bass but had the base turned down and it sounded fine. but when i go into linux and run the same file in xmms the speakers sound like they are busted or something. they have a scratchy/muffled sound when the bass line comes in. i figured my sound card wasn't configured correctly so i went into /usr/sbin/ and ran soundcardconfig and sure enough it said it doesn't support ac97 sound card. So i have a default configuration? because i can here sounds just fine but i guess they sounds are on the lowest possible quality for my sound card or something? can some one tell me how to make knoppix recognize my AC97 sound card?
Type cat /proc/pci and see if you can find your soundcard. I also experience that sound via xmms is not that perfect. Meaby trying a different output plugin can improve sound (ctrl + v).

Apple Genuine OEM 30W USB-C Power Adapter A1882 Used *A Grade*
$13.29
Genuine Apple Power Adapter Extension Cable 6FT White OEM MacBook MK122LL/A
$10.99
Genuine/OEM Apple Duckhead Two-Prong Plug - MagSafe AC Wall Adapter - Set of 25
$33.99
Open Box Apple OEM 30W USB-C Power Adapter MW2G3AM/A - A2164
$15.99
Genuine OEM 61W USB-C Power Adapter Charger For Apple MacBook PRO 13 inch A1718
$22.00
Genuine OEM Apple MagSafe 2 45W AC Adapter Charger for Macbook Air 2015 11" 13"
$14.24
Genuine OEM 96W USB-C Adapter Charger for Apple MacBook Pro 16-inch with Cable
$23.99
Genuine OEM Apple Power Adapter Extension Cable for MacBook Pro Air
$8.99
Genuine 67W USB C Charger for Apple MacBook Pro/Air 13/14 Inch A2518 +Cable OEM
$25.80
Genuine/OEM Apple Duckhead Two-Prong Plug - MagSafe AC Wall Adapter 45W/60W/85W
$8.99