With regard to converting MIDI files to wav files, check out Call for
Help on ZDTV.com.  About a week ago they told how to use your sound
card on your computer to convert MIDI to wav.  Use the search engine
and you should be able to find it.  It involves using the sound card
to play the file and then recording it using Windows Sound Recorder.
I would suggest that, the better your sound card is when playing MIDI,
the better the final file will be.

Jim Cook