sound is so low

I use
Code:
FreeBSD mfaridi.com 7.2-RELEASE-p3 FreeBSD 7.2-RELEASE-p3 #0: Mon Aug 17 11:42:55 IRDT 2009     Mostafa@mfaridi.com:/usr/obj/usr/src/sys/GMFARIDISRV8  amd64
and I use Gnome
I use Headphone to listen music, but I do not know why sound is so low and change volume of sound to high , but still it is so low
what I must do ?
 
killasmurf86 said:

When I type mixer I see this

Code:
Mostafa ~ [161] mixer                                                                                                                11:20
Mixer vol      is currently set to 100:100
Mixer pcm      is currently set to  75:75
Mixer speaker  is currently set to  75:75
Mixer line     is currently set to  75:75
Mixer mic      is currently set to   0:0
Mixer cd       is currently set to  75:75
Mixer mix      is currently set to   0:0
Mixer rec      is currently set to   0:0
Mixer monitor  is currently set to  75:75
Recording source: mic
 
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