Me and my brother were recording some music last night on sonar, he is an acoustic alternative musician and i am a hip hop artist so the way we record our vocals/instruments differ. For some reason when he would use his guitar to record it would cut off when recording and were forced to loop it. Also we're now having problems with choppy feed back. I asked yahoo answers and there was no dead answer. It took me to another forum and they said it depended what frequencies the mixer and program were on. i have an alesis multi mix 4 USB mixer. Any small helpful feedback would be appreciated, thanks.