arecord on freerunner

[hadroneo]

Hi,

I would like to record a sound with my freerunner with arecord program.

for this i run:

$ arecord -c 2 -f S16_LE -r8000 -d 10 test.pcm

with the following result:

ALSA lib pcm_dmix.c:805:(snd_pcm_dmix_open) The dmix plugin supports
only playback stream arecord: main:546: audio open error: Invalid
argument

Also i run:

$ arecord -l

with the following result:

**** List of CAPTURE Hardware Devices ****
card 0: neo1973gta02 [neo1973-gta02], device 0: WM8753 HiFi WM8753
HiFi-I2S-0 [] Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: neo1973gta02 [neo1973-gta02], device 1: Voice WM8753
Voice-PCM-1 [] Subdevices: 1/1
  Subdevice #0: subdevice #0

And :

$ arecord -L

give:

null
    Discard all samples (playback) or generate zero samples (capture)


Which PCM can i give to --device option to arecord program for
recording a sound on freerunner.

Best Regards.
hadroneo.