MIDITrail is a MIDI player which provides 3D visualization of MIDI data sets.
You can enjoy not only listening but also viewing.
MIDITrail supports Standard MIDI File (format 0/1), and multiple MIDI ports.
1. Click "Option" -> "MIDI OUT…", select "Apple DLS Music Device" to Port A.
2. Drop your MIDI file into the window.
3. Push space key to play/pause, and push ESC key to stop.