I just seem to have no luck with USB audio interfaces First the Tascam US-122L now Blue Icicle. There is a bad batch of Icicles on the market. It seems like the early ones have a problem with voltage adjustment circuitry and add a high-pitched sound to the audio recorded with dynamic microphones. I have no condenser microphone to test my bad Blue Icicle with, but I can confirm that the unit I got does have this problem. On the other hand, Blue Icicle does work with all of the audio apps that the Tascam US-122L doesn't. (see my other post) I will now try to get a replacement from Blue. Just filled in the Service Request Form.