I have a USB mic that I am running straight into the USB port on my mac powerbook pro. I am getting an input in the system pref "sound" panel but no input into REW. I've tried every possible setting combination with no results. I've been taking measurements with the built in mic so the software is working. I am running Mac OS X 10.4.11 Kernel Versionarwin 8.11.1. What am I missing??? Do i need to upgrade the software???