Slight feedback or static on USB input?
I'm using an old 30 gig iPod (the first one to have video, circa 2005/2006... I don't remember what generation it is). Other than the interface being a little slow, it seems to work fine.
I do, however, notice a little bit of static/interference during quiet portions of songs if I have the volume up high. Sounds a lot like a ground issue. Not sure whether a GLI would help or not. Perhaps it is my cord (still using the original cord that came with the iPod)? Anyone else notice this?