separate volume from system

I use winamp a lot. When I'm in-game, and someone is playing music it interferes with mine. turning down the ingame sound is the same as turning down the system sound, so it also turns down winamp. Could it be made so that the volume was seperate from system volume?

(PS. there are also other issues with sound, for instance, turning down wind volume doesn't work, and i think one or more of the bottom 3 settings also seems to have no effect.)