No, you definitely don't need to do this.
Did you make sure to open an alsamixer and unmute the master channel?
I can't see anything wrong with what you've described.
Here's my /etc/modules.d/alsa file for comparison (for two sound cards,
rather than one):
# ALSA portion
alias char-major-116 snd
# OSS/Free portion
alias char-major-14 soundcore
## ALSA portion
alias snd-card-1 snd-ens1371
alias snd-card-0 snd-intel8x0
# OSS/Free portion
alias sound-slot-0 snd-card-0
alias sound-slot-1 snd-card-1
##
# OSS/Free portion - card #1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
## OSS/Free portion - card #2
alias sound-service-1-0 snd-mixer-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-12 snd-pcm-oss
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
# Set this to the correct number of cards.
options snd cards_limit=2
--
Sebastian James - Embedded Systems.
Hypercube Systems Ltd 'Embedded Linux Solutions'
35 Walkley Crescent Road, Sheffield, S6 5BA
Tel: 0845 4580277 Web: www.hypercubesystems.co.uk
Seb,