Love it!

This is a fantastic free app. Its super easy to turn the sound on the first time you use it. Just go to Option> Midi Out> and choose Apple DSL Music Device. Thats it. Endless entertainment. Find thousands of free midi files on the web. Just Google your favorite songs with "title midi file", download, then open them with MIDITrail. Also very easy to slow down and speed up tempo while watching and listening. Im really enjoying this. Cheers :o)

Rhinylam about MIDITrail