Canadianbanjo

I am just using in-ear monitors - Westone with I think 3 drivers. They are more eq'd to be flat, but if I plug the westones right into my computer jack it the "iTunes" songs sound nice and clear...

I have the Stomp hooked up to my computer via the USB. The guitar sounds as it should but when I play songs on my iTunes they sound like they are almost "re-mixed" compared to when I just plug the same pair of headphones directly into my computer jack and listen to them. Through the Stomp it's very dull sounding and not very detailed. Is the playback that is coming through the USB running through some compressor or something? Thanks!!