Choosing your Sound Format MIDI is typically used to play music. MIDI files contain instructions about how to play musical notes and which instruments play those notes. How a MIDI file sounds on a reader's computer depends on the quality of their MIDI interpreter. Audio files contain recordings of actual sounds. When you speak into a microphone, you create an audio file.
Audio files work well for recording voice and sound effects.
MIDI Saving sound files as MIDI files is often a good choice when you're looking for quality sound with the smallest file size possible. To make a MIDI file, it helps if you know a little about music or can play an instrument. You have to have MIDI software that gives the computer instructions about things like what notes to play, how long to hold them and what sound should be used. You also need some instrument source. Most MIDI software lets you create several parts or tracks.