I am trying to help a friend of mine who is building a recording studio consisting of a control room and 2 live rooms. he is planning the panels connecting the rooms together and was wondering if i could get some more opinions in respect to the panels So far hes got: As you can see in the pics here are the type of connections he included including speaker, instrument, usb, hdmi etc.. So what do you guys think? any specific things he might have forgotten? any comments? Thanks!