I have some problem with Gnome Volume Control 2.6.1

There are 2 Sound Card in my computer box,
1. On Board
2. SB Live! -> /dev/dsp2 and the mixer is /dev/mixer1

I got my sound working by playing mp3 in XMMS using /dev/dsp2, and control the volume using /dev/mixer1.

For some unknown reason, Gnome Volume Control does not pointing to the right device. My guess, the mixer is pointing to the onboard sound which has 3 port (Line-1, Line-2, Line-3).

Is there some way to set the volume control to the correct mixer?

Thanks in advance