root ~ # cat test_audio 
#!/bin/sh
#what: a script to determine which audio driver you want.
#why: because I had no idea, so I tried them all.
#who: Jon Disnard (aka masta).
#when: october 2007.

for I in /boot/kernel/snd_* ; 
do      [ "$I" = "/boot/kernel/snd_driver.ko" ] && continue
        printf "$I\n"
        kldload $I > /dev/null
        ls /dev/dsp > /dev/null 2>&1 && { 
                printf "\nYOUR AUDIO DRIVER IS ${I}\n\n" 
                exit
        }
        kldunload $I
done