Help: Running two programs at once which hog /dev/dsp

I am just curious as to if anyone can solve this small problem I am having. I was trying to play True Combat this afternoon and I wanted some music to go with it, however, when I open audacious2 it also attempts to use /dev/dsp to play sound and as a result I can only get sound out of one at a time (this only happens with some programs as well, for instance I can run audacious2 and totem simultaneously with no problem (if someone could explain that it might help...?)).

Long story short, why can I use some sound devices simultaneously while others fail? Is there any way to run True Combat and a music player together (I don't even know what audio devices TC uses really, but assume most others on Ubuntu run through pulseaudio)?

ps: If it helps I think I have an integrated nForce card.