Hello, I know that ATRAC compresses the audio somewhat by removing all the frequencies that the human ear cannot hear. I have also found out another way that it might compress the audio. I recorded one of my lectures onto MD and then transferred it onto as .wav file on my computer. When I zoomed into the waveform of the sound, there wasn't a continuous wave, there were many little 'packets of sound'. Now I think that the MD must also take the 'packets' so fast that we can not distinguish them as seperate (kind of like the 24 frames per second in a movie). What do other people think? Al. ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]