I will say that I miss prox chat in Halo 2. Being able to communicate with the other team had a certain novelty to it. It is nice to hear out new and differenct concepts but when it comes to application, I'm not sure this has teeth. Practically, it would have always be on or always be off. This would require a menu option or a button press which would more than likely take away from the experience. Now that I'm thinking about it, what happened to loud footsteps being enough to lure enemies? Or magic? Or a punch to the face? Your argurment for filtering would be limited to decible levels (loudness) since it is all that the current tech would reasonably be able to do. I don't believe I have ever had that grace over XBL. I really wish some people would locate the mute button before they sneeze, burp or yell for some cheesy poofs into the mic. The issues that I have personally encountered are ambient/background noise, noise from the game/application, and other people talking in the room. You might try to argue that each of these could be the same thing, but I want you to consider some specifics. Ambient noise could be a fan or A/C. I'm convinced my brother in law sits under [url=http://technabob.com/blog/wp-content/uploads/2009/05/baf-1.jpg]this[/url], or even has his setup in one of [url=http://farm1.staticflickr.com/62/154114932_fe0868ecb2.jpg]these[/url]. The noise is constant. I usually ask him to mute himself or turn down the jet engine. This would be heard over prox. Sound from the application or game is my most frustrating foe. I have had an application tell itself what to do from what was said in the show I was watching (which was the wrong voice command so I was doubly disappointed). I run into another issue when I'm watching streaming video through an application and I have to talk over the people talking on the show for it to listen. I feel like throwing my controller that I obviously am not holding at the time which is even more frustrating that I can't do something that I wouldn't anyways. Even worse yet, players that play their sound system high enough that I hear their character breathing. The potential for reverb in prox is apparent. Most importantly, other people will ruin your day for there own amusement or by accident. I believe the only argument I need is someone learning FUS RO DAH that isn't you and in the room while you try to convince the guards that you had nothing to do with the arrow to their other knee. Also spouses, babies, pets roommates, parents, etc. Unless you have a perfect gaming room that nobody talks or enters, then you will likely have some sort of interaction that can be heard. I think you have a fun idea but there are easier ways to accomplish the same result of luring enemies. But so you know, I would use the junk out of prox chat against enemies. Sadly, I would likely resort to 'The Departed'-esque taunting and just shame myself.