I know, this is not the bookport list but my question has to do with my bookport and my p t r also. I record several hours each weekend from n p r on my p t r and would like to play said files on my bookport. each time I try the bookport says, unfiltered files not supported. I am recording at 128 stereo so the quality will be good. Is their anything I should do differently when recording to say filter these files. Wonder what an unfiltered file is anyway. Any help will be appreciated, Phil Parr.