This may sound like a dumb question, but how do I know if the source audio file is compressed or not? (I will be transferring mono sound from Philips cassette tapes to WAV file via Flash Drives. I furthermore do not know what bit rate the original sound files are in. (or does that even matter?) I have no control in using the cassette recorder to adjust anything. It just does the job as do countless ordinary cassette recorders since inception. Thanks, John