nothing you can do....
i have your setup, gtxp
its the way the dvd software is, the sound is always low, and youre right, someone comes in on AIM and its like you knocked down the damn door.
there isnt no dvd sound volume option, would have been cool.
just crank it up, and kill AIM😉 i think its cuz its meant for digital out to a receiver, and trying to move away from desktop speakers, since it is 5.1