Just got the blue icicle preamp. It's supposed to be plug and play, but I can't get it to work. Everything seems to have installed correctly, I didn't get any error messages. But even with the gain all the way up, there's no signal. I've uninstalled and reinstalled it several times as well as restarting my computer. The strange part is that if I shake it, I do see the signal level jump in the track that's armed to record. But tapping on the actual microphone gives me nothing. I'm using Sonar and an SM58. Anyone have any ideas?