Hey! So, for the party chat thing it's simple. I had to google it myself to find out how to do it, so I guess I'd help you out. All you have to do is make sure your fireteam is in game chat. (Yeah . . . not exactly "Party chat") Anyway, make sure everybody is in game chat and for audio make their voices "blended" meaning it will come out of the tv and your mic. This will make it so that the people watching your stream can hear everybody in your fireteam.