[MPlayer-users] Problem with 6 channel AC3 and mplayer volume

[Sasha Z]

I have an MCP-T chipset on my motherboard, and am using the onboard
analog audio. Most content plays back fine via mplayer, but 5.1
channel AC3 doesn't function properly.

No matter what the volume is, the actual volume is exactly the same.
I'm using the analog outputs, and the alsa master channel for my
mixer. Does anybody have thoughts on what to do to get 5.1 channel ac3
audio to allow volume change from mplayer?

Thanks,
Sasha