If your sound device is:

`
cat /dev/sndstat
FreeBSD Audio Driver (newpcm: 32bit 2009061500/i386)
Installed devices:
pcm0: <hda Realtek ALC883 PCM #0 Analog> at cad 0 nid 1 on hdac0 kld snd_hda [MPSAFE] (1p:1v/1r:1v channels duplex default)
pcm1: </hda><hda Realtek ALC883 PCM #1 Analog> at cad 0 nid 1 on hdac0 kld snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
pcm2: </hda><hda Realtek ALC883 PCM #2 Digital> at cad 0 nid 1 on hdac0 kld snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)

</hda>`

Add the lines in /boot/loader.conf

<br /> sound_load="YES"<br /> snd_hda_load="YES"<br /> hw.snd.default_unit=1<br />

hw.snd.default_unit=1 can be loaded from sysctl:

<br /> sysctl hw.snd.default_unit=1<br />