MIDI notes are visualised in 3D space if you play back files in a mixed immersive mode. The speed of movement (dimension of data visualisation) can be adjusted. You can also load your own MIDI files. The app comes with a Roland GS (extended General MIDI Standard) compatible sound module and is able to play back all properly created GM/GS/XG MIDI files. Different instruments (MIDI channels) will have different colors.