I've been using "Melody Assistant" from MYRIAD Software (a French firm) for several years now.

MYRIAD Software

You can get a free "crippleware" download, which is pretty functional in many ways, but the registration is really reasonable, and is good for life (of the Company, at least) and for unlimited upgrades, of which there have been legion since I bought it.

There are a few features that I think could stand improvement - like the print setup, for instance - but it has loads of bells and whistles which I don't have a clue how to use nor do I need for what I do.

And it will put a MIDI file up as a score, which you can play, edit, transpose, chord, change instrument, tempo, & etc., then print it off if you want to.

And I'm pretty sure that you can convert MIDI files into WAV or Mp3, too.

They also sell "OmER" OCR program for music scores - but I've found that your scores have to be sharp, clean, and clear or what you get won't look or sound anything like music!

Since I work a lot with antique, archival music, it really doesn't work out for me - it's a lot less hassle just transcribing the score from the yellowed, frazzled old pages directly on to MELODY and going from there.

Besides; it helps me to excersize what limited music reading and writing skills I have.

I have composed one tune already on MELODY, and it was a lot of fun, actually.

Check it out; the test ride is free!

And a good music/audio recording/editing freeware program is "AUDACITY".

Still a bit of a Beta, but once I got the hang of it it does some really neat things with audio files.