Anyone know how I can convert a MIDI file to a wav or mp3 file?

I don't mind if it's converted to wav first, because I can just convert it an MP3 file, or going straight from MIDI to MP3 is fine too.

Does anyone know of a program that will convert MIDIs to a different format? I see lots of programs that convert WAV > MP3 and vice versa, but no MIDI .


Thanks for any help.