USB sound and linux

rpm -qlp alsa-utils* yielded the following:

/usr/bin/aconnect
/usr/bin/alsamixer
/usr/bin/amidi
/usr/bin/amixer
/usr/bin/aplay
/usr/bin/aplaymidi
/usr/bin/arecord
/usr/bin/arecordmidi
/usr/bin/aseqdump
/usr/bin/aseqnet
/usr/bin/iecset
/usr/bin/speaker-test
/usr/sbin/alsactl

my modprobe contains these lines:

options snd cards_limit=8
alias snd-card-0 snd-intel8x0
options snd-intel8x0 index=0
alias snd-card-1 snd-mpu401
options snd-mpu401 index=1
alias snd-card-2 snd-usb-audio
options snd-usb-audio index=2