You know LE, this yellow faces we put in our mail to pin point any hidden moods and meanings, are really helpful, but still I find them quite peculiar. I mean you can say nasty things and then put a smiling face to indicate that you are only joking. If the written words can't convey the deeper meanings of the message and if there is even a shadow of a doubt about the good will, then I will just have to admit to myself some things that can't be revealed here.
Anyway, for a solution to your problem. If you burn in CDs all these recordings, I think that you should try ripping into MP3s from these CDs. I believe that will give you a hard copy to listen at home and a better start point to begin converting these files. I find that really "light" programs like CDex give excellent results and have easy to use interface to chose the settings. Good luck!