Fun app for visualizing and playing MIDI files

I had no technical problems with this app. You just have to actually read the brief manual. I think it is does wonderfully at visualizing MIDI information. It not only can play MIDI files, but if you have a MIDI device capable of sending MIDI IN, and you choose "Start Monitoring" it will create a live visualization of what you are playing. For free even!

willswords about MIDITrail