I've tried recording on and off with my Tascam DP-02, but I've had some issues with it. 1: Basically zero vocals get picked up on a mic going into it unless I turn the gain up all the way, but then it picks up everything in the house. I'm using an AKG D 9000. 2: I have a similar issue with my acoustic guitar, but turning up the gain makes it overly trebley and unpleasant. 3: When I input the files to my computer, they're in a weird file format, which I then have to convert, and they get imported at an even lower volume, which means I have to up the volume, which creates unbearable hiss. Basically, I can't get any good sounds recorded, and I'm completely unfamiliar with recording. What am I doing wrong?