Mostly from my desktop. FLACs mostly and variable-rate mp3 encoded using LAME using the highest quality setting. I agree Modi is definitely an improvement over uDAC-2, but uDAC-2 treble sounds a little rolled-off even compared to an fourth-generation iPod to me. So this is the first in-your-face improvement, the amount and quality of the treble and detail. The better instrument separation and soundstage and the tighter bass are less evident. But very perceptible, don't get me wrong. The more I hear to the stack, the more I like it One thing I noticed is that PowerDVD + Reclock (to be able to use Wasapi when playing Blu-ray discs) is that audio and video get out of sync more easily with Modi than uDAC-2. Probably due to the asynchronous USB audio mode in Modi. Anybody else experiencing this?