The easiest way is to set up one of your toons on PC/laptop by him/herself. That way you dont have to worry about muting anybody. It's only when you have 2 or more accounts on the same screen or connected thru the same keyboard that you have to worry about mass chatting. I have experimented doing 2-laptop, 1-laptop, 2-laptop(or PC) and found this is the easiest to way to communicate.