Studio Operations Training When in the studios, have you ever asked yourself: Where has the Phone input gone to on the panel? Why is the guest mics level so low? What level meters should I take notice of? How do I set the right headphone level? How do I change studios from 1 to 2, or 2 to 1? Where has the 2nd phone handset gone? Why won't the phone call go to air? Studio Broadcast Telephone System