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Liquid Awesome
Soundbyte said:This really isn't a gaming issue, more of a "making sure the players realize that the same social rules apply as anywhere else" issue. As such, don't feel like you have to solve it single-handedly as the Game Master.
I think Soundbyte hit the nail on the head.
Personally, I would not take up my valuable time formulating a "system" for them speaking. I'd probably just get their attention somehow the next time it happens and clearly declare, "Guys! I'm not your dad and it isn't my job to get you to talk to each other instead of yell at each other. Either lower your voices and speak respectfully, one at a time, or I'm going home."