Alsa "looks" OK, but no sound is actually played

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Hi. I have a macbook aluminium (5,1). I'm trying to get the soundcard to work.

localhost ~ # lspci | grep -i audio
00:08.0 Audio device: nVidia Corporation Device 0ac0 (rev b1)

That being said, i enabled the corresponding modules in the kernel. As can be seen above, the modules are being loaded correctly,

localhost ~ # lsmod
Module                  Size  Used by
snd_pcm_oss            37264  0
snd_mixer_oss          14616  1 snd_pcm_oss
snd_seq_dummy           3020  0
snd_seq_oss            29824  0
snd_seq_midi_event      6616  1 snd_seq_oss
snd_seq                50064  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device          6668  3 snd_seq_dummy,snd_seq_oss,snd_seq
snd_hda_codec_realtek   243484  1
snd_hda_intel          26408  1
nvidia               8112568  28
snd_hda_codec          54296  2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep               7840  1 snd_hda_codec
snd_pcm                72160  3 snd_pcm_oss,snd_hda_intel,snd_hda_codec
snd_timer              20296  2 snd_seq,snd_pcm
snd                    58920  13 snd_pcm_oss,snd_mixer_oss,snd_seq_oss,snd_seq,snd_seq_device,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
applesmc               28860  0
hwmon                   2648  1 applesmc
soundcore               6608  1 snd
snd_page_alloc          8808  2 snd_hda_intel,snd_pcm

Alsaconf ran without any problems. Then i made sure that nothing was "mute" at alsamixer, as can be seeing in the image whose link is below:
 
http://img36.imageshack.us/i/alsamixer.png/


Finally, i decided to make a simple test. I tried to play a mp3 file with mplayer. Mplayer looked like it was playing the song:
  http://img32.imageshack.us/i/mplayer.png/

Nevertheless, couldn`t heard any sound in the notebook speakers, or using a headphone. So, you guys know what can i do in order to get this thing working?


Leonardo.
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