What I don't understand about these hacks is how are we all able to hear them? Are the sounds already hard-coded into the game, just not available to be accessed in the 360 version? I don't understand how I can hear these sounds if they aren't actually part of the CD I have.
You are right, They are already in the game. (Left in when it was ported from PC)
To use them they change their button layout with a modding program on a PC.
So they would change (X) or (Y) or even the D-pad to Go!Go!Go! or Help! etc, etc. (Basically use buttons you don't "need" to play)