Not sure what you mean by sound systems. Is it all the sounds that currently exist, or is it the way they are being used?
In any case - the sounds in game depend a lot on what I'm able to find and license. I cannot affort to pay for studio quality sound effects / voices, if that's what you mean. Re: how the sounds are played - they are played by the game engine, over which I have no control. What I can say is that they are positioned correctly with regards to the character they occur on