Alsa - running or not?

Quick question: could someone tell me if there is a surefire test to establish if my sound system is using alsa or not?
I "think" I have got alsa running, but alsaconf does not detect my sound card (onboard CM8738 chip). 
Sounds are working OK (except no streaming audio in RealPlayer), but how can I check whether it is alsa or some other sound system that is producing the sound?
I was experimenting with the SourceMage distro last week and after installing alsa there, I ran alsaconf and it picked up my CM8738 straight away, so I'm not sure why the same is not happening in Arch.

Thanks - but it's bad news, this shows alsa is not working!
I could really use some help with this problem.  Sorry to post at length, but I have been trying to crack this one for days and don't seem to be getting anywhere.  I am running the 2.6.1 kernel and have a CM8738 onboard sound chip.
aplay -v /opt/kde/share/sounds/....wav     nothing happens for about 20 seconds, then no audible output but:
aplay -v /opt/kde/share/sounds/KDE_Window_Open.wav
Playing WAVE '/opt/kde/share/sounds/KDE_Window_Open.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Stereo
Plug PCM: Hardware PCM card 0 'C-Media PCI CMI8738-MC6' device 0 subdevice 0
Its setup is:
stream       : PLAYBACK
access       : RW_INTERLEAVED
format       : S16_LE
subformat    : STD
channels     : 2
rate         : 22050
exact rate   : 22050 (22050/1)
msbits       : 16
buffer_size  : 11025
period_size  : 2756
period_time  : 124988
tick_time    : 1000
tstamp_mode  : NONE
period_step  : 1
sleep_min    : 0
avail_min    : 2756
xfer_align   : 2756
start_threshold  : 11024
stop_threshold   : 11025
silence_threshold: 0
silence_size : 0
boundary     : 1445068800
aplay -l   gives:
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: CMI8738MC6 [C-Media PCI CMI8738-MC6], device 0: CMI8738-MC6 [C-Media PCI DAC/ADC]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: CMI8738MC6 [C-Media PCI CMI8738-MC6], device 1: CMI8738-MC6 [C-Media PCI 2nd DAC]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: CMI8738MC6 [C-Media PCI CMI8738-MC6], device 2: CMI8738-MC6 [C-Media PCI IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
Despite this, alsaconf reports: "No supported PnP or PCI card found"
lsmod gives:
snd_seq_midi            6432  0
snd_opl3_synth         14148  0
snd_seq_instr           8384  1 snd_opl3_synth
snd_seq_midi_emul       6784  1 snd_opl3_synth
snd_ainstr_fm           2176  1 snd_opl3_synth
snd_seq_oss            33120  0
snd_seq_midi_event      6176  2 snd_seq_midi,snd_seq_oss
snd_seq                54736  8 snd_seq_midi,snd_opl3_synth,snd_seq_instr,snd_seq_midi_emul,snd_seq_oss,snd_seq_midi_event
snd_pcm_oss            48964  0
snd_mixer_oss          16768  1 snd_pcm_oss
snd_cmipci             32696  1
snd_pcm                90784  2 snd_pcm_oss,snd_cmipci
snd_page_alloc          8996  1 snd_pcm
snd_opl3_lib            9056  2 snd_opl3_synth,snd_cmipci
snd_timer              22180  3 snd_seq,snd_pcm,snd_opl3_lib
snd_hwdep               7168  1 snd_opl3_lib
snd_mpu401_uart         6272  1 snd_cmipci
snd_rawmidi            20512  2 snd_seq_midi,snd_mpu401_uart
snd_seq_device          6280  6 snd_seq_midi,snd_opl3_synth,snd_seq_oss,snd_seq,snd_opl3_lib,snd_rawmidi
snd                    45476  18 snd_seq_midi,snd_opl3_synth,snd_seq_instr,snd_seq_oss,snd_seq_midi_event,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_cmipci,snd_pcm,snd_opl3_lib,snd_timer,snd_hwdep,snd_mpu401_uart,snd_rawmidi,snd_seq_device
soundcore               7232  1 snd
All the modules shown by lsmod in my working SourceMage installation are also present in Arch.
My /etc/modprobe.conf (again this matches SourceMage):
# ALSA portion
alias char-major-116 snd
alias snd-card-0 snd-cmipci
alias snd-card-1 snd-cmipci
alias snd-slot-1 snd-card-1
alias snd-card-2 snd-cmipci
alias snd-slot-2 snd-card-2
alias snd-card-3 snd-cmipci
alias snd-slot-3 snd-card-3
alias snd-card-4 snd-cmipci
alias snd-slot-4 snd-card-4
alias snd-card-5 snd-cmipci
alias snd-slot-5 snd-card-5
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
# module options should go here
# OSS/Free portion
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
# 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
Finally, I have checked in alsamixer and aumix that there are no muted settings and that volumes are set where necessary.  I have run out of ideas....!

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