Hey everyone, I'm praying that someone can help me out with this issue. It's driving me absolutely mad. I am simply trying to record vocals over an instrumental in Garageband (only two total tracks). To get it out of the way up front, all of my volume sliders are set at 0 dB. I am using a USB microphone with a built in audio interface so there is a gain knob right on the mic. I have it set properly in order to make sure that the clipping LED on the microphone never turns red. So basically, I have 2 seperate tracks: the instrumental track and the vocal track. The dB meter on the instrumental track shows that the track is at the perfect volume. For the purpose of trying to figure out my problem, I've recorded my vocals lower than I would even like to and the dB meter on the vocal track is SUPER low-- so low in fact that the waveform is barely even visible. If I play the instrumental track by itself, the master track dB meter shows the same level as the track dB meter. If I play the vocal track by itself, the master track dB meter shows the same level as the track dB meter. This is where the problem occurs: When I play the tracks simultaneously, even though neither of them are clipping, the master track dB meter for some reason goes well beyond the red and the red LEDs light up indicating that the master track is clipping out. I cannot figure out what the problem is for the life of me. I've attached a picture to help illustrate the problem. Notice the levels on the individual tracks and then notice the levels on the master output. If anybody has ANY insight as to what my problem could be, pleeease HELP!!! If there are any other details you would like to know, just ask. Thanks guys.