Important note about sound:

--After running alsa_snddevices, sound was broken even after rebooting into 2.4.21. I just figured out what it was today, after trying to /dev/MAKEDEV dsp and getting nowhere. Then I did an ' ls -l /dev/dsp* ' and figured out what happened:

lrwxrwxrwx 1 root root 9 Sep 4 20:56 /dev/dsp -> /dev/dsp0
crw-rw---- 1 root audio 14, 3 Sep 4 20:56 /dev/dsp0
crw-rw---- 1 root audio 14, 19 Sep 4 20:56 /dev/dsp1
crw-rw---- 1 root audio 14, 35 Sep 4 20:56 /dev/dsp2
crw-rw---- 1 root audio 14, 51 Sep 4 20:56 /dev/dsp3

--Notice the permissions:
o User=root=rw
o Group=audio=rw
o Other = NO PERMISSIONS!!

--So to solve this I added my non-root userid to group "audio" in /etc/group, and now sound works in 2.6.0-test4!!