It seems like you just need to know who is currently speaking and mute them if you aren't actually hearing their voice. Perhaps Uberconference (http://www.uber

It seems like you just need to know who is currently speaking and mute them if you aren't actually hearing their voice. Perhaps Uberconference (http://www.uberconference.com http://www.uberconference.com) solves this issue? (No personal experience with it and there may be other products that also help with this.)