I'm in the process of converting a series of lectures from cassette tape to CD. I have successfully encoded them to my hard drive in MP3/WAV format, but I'd like to take this opportunity to restore the audio as best I can. I have seen several products that allow you to do noise reduction, but I have other problems as well: 1) Lectures that are too soft to hear. 2) Lectures in which the dynamic range is too large, i.e., if you set the volume to hear the soft parts, the loud parts will irritate you. 3) Muffled sound (would like to make it "crisper") Can anyone point me to software and/or techniques to solve these problems and improve the recordings? Thanks for any and all help.