Hello, I'm an extreme novice when it comes to recording. I purchased a PreSonus AudioBox and have been using my Ipad mini to do some simple recording of myself and the acoustic guitar. Last week I did a recording and it sounded not bad. Last night I tried and the vocals were way overpowering. I had it on the same levels so not sure why this came out different. I guess my question is based on everyone's experience what levels for the guitar and vocal are a good balance to use with using an interface and garageband via and ipad mini? Thank you so much for the help!