Thanks. The reason for asking was that I tried the front USB (USB stick) and thought i sounded really bad, thin metallic and "cheap". I played a 24/96 track downloaded from HD tracks. I have the same track on CD and it sounds way superior. Is there a setting I might have forgotten?
I cannot think of any "tricks" but I have not heard any significant differences between a ripped file on USB stick and the original disc in the Oppo.