I just had to buy a new card for my jukebox computer.
I had a Turtle Beach Santa Cruz card which worked well with 2.4 series kernels and which plays
fine in 2.6 kernels but won't record. I needed to do some recording again hence the new card.
I picked up a Sound Blaster Audigy SE at CompUSA
for about $30 which has 24bit recording and works well with MEPIS 8.5
If you're not in a hurry you can find them on EBay for about 1/2 that price (when you include the shipping).
Kmix may not include all the channels you need to adjust in its default display, but they can easily be selected in the Kmix settings menu.