Hi... default resampler is linear phase and completely flat right up to 20kHz, so anything you are hearing from that would be between 20-22kHz. Not dithering could make a difference if the track is recorded at a low level, but I would really doubt you are listening to music that uses more than 16 bits. So there are two questions:Are you re-upsampling back up to 96? Otherwise there could be clues given away during switching. Are you setting the volume to actual listening levels and leaving it there?