I have mbox2 mini and protools. I record my guitar first and then vocals on input 1. The problem I am having is when the mix knob is all the way to the left I can hear the guitar live with no delay, which is good. But when I go to record vocals all the way to the left, I cant hear the guitar anymore. The further I turn it to the right the louder the guitar gets and the more delay on vocals. How can I get a straight sound with no delay for the input, how will I be able to record?