USB mic not working

Hi All.
I'm new to Archlinux and I have the following issue with my USB WebCam (Microsoft VX-1000) : I can't get no sound out of it.
Both the video and audio devices are detected and proper modules are loaded (gspca and snd-usb-audio).
Video works fine.
arecord -l give the following results :
**** List of CAPTURE Hardware Devices ****
card 0: CK8S [NVidia CK8S], device 0: Intel ICH [NVidia CK8S]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: CK8S [NVidia CK8S], device 1: Intel ICH - MIC ADC [NVidia CK8S - MIC ADC]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: camera [USB camera], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
which looks ok to me.
But when I tried to record something (arecord -D plughw:1,0 -d 5 test.wav) then play it back, I can't hear anything.
I even tried to cat /dev/dsp1 into a file then play it back with aplay. Nothing.
All this tests were run while in command line with no DE running (to prevent conflicts with ESD and the like).
After 5 hours of googling, I can't find any solution. Help me, pleeeaaaase.
Here are some more info, in case it might help :
lsusb
Bus 003 Device 001: ID 0000:0000
Bus 001 Device 002: ID 045e:00f7 Microsoft Corp.
Bus 001 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
lsmod | grep snd
snd_usb_audio 73184 1
snd_usb_lib 14208 1 snd_usb_audio
snd_rawmidi 19104 1 snd_usb_lib
snd_hwdep 7044 1 snd_usb_audio
snd_seq_oss 29184 0
snd_seq_midi_event 6528 1 snd_seq_oss
snd_seq 46672 4 snd_seq_oss,snd_seq_midi_event
snd_seq_device 6796 3 snd_rawmidi,snd_seq_oss,snd_seq
snd_pcm_oss 39072 0
snd_mixer_oss 14464 1 snd_pcm_oss
snd_intel8x0 28828 1
snd_ac97_codec 91940 1 snd_intel8x0
ac97_bus 2432 1 snd_ac97_codec
snd_pcm 68484 4 snd_usb_audio,snd_pcm_oss,snd_intel8x0,snd_ac97_codec
snd_timer 18820 2 snd_seq,snd_pcm
snd 43492 16 snd_usb_audio,snd_rawmidi,snd_hwdep,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer
soundcore 6496 1 snd
snd_page_alloc 7816 2 snd_intel8x0,snd_pcm
usbcore 115208 6 snd_usb_audio,snd_usb_lib,gspca,ehci_hcd,ohci_hcd
ls /dev/snd
controlC0 pcmC0D0c pcmC0D1c pcmC1D0c timer
controlC1 pcmC0D0p pcmC0D2p seq
Thank you very much in advance.
Nico.

I mic is unmuted, that was the first thing I checked. And I ran camE during the test to be sure that the webcam is on (green led on).
Another strange thing is, when I run alsamixer, I can only lower the mic capture volume, not raise it. Curious. It works ok in gnome-alsa-mixer though. I guess their might be an issue with the device's control interface, due to a problem with the alsa driver (my webcam not being supported yet).
I really can think of anything else.
Anybody has another idea... please... before I lose the rest of my hair...

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