You might look at baking your tapes before playing them:

http://en.wikipedia.org/wiki/Tape_baking

And if longevity of your recordings is what you are after, MP3 may not be the best choice. At the very least I would do MP3 and WAV.

And I think I agree with the previous commenter. Simply mentioning Drupal in passing is probably not enough to warrant posting to Drupal Planet. Few Drupallers will find any benefit to this post.