Diane, Well, first, record it exactly as you have done and keep & archive the file(s) containing that recording(s) [use this as a master copy]. Then you can import those files into audio programs containing cleaning filters such as SoundSoap, which is an external program (that also has a plugin that allows it to be used within certain other audio programs). There may be other noise reduction programs. It allows you to tune out as much of the scratch as you can without losing too much of the audio that you need. Also, equalize the resulting audio to emphasize voice frequencies. Then compress the audio as you wish, and normalize the result.