Derrick Ward, developer of MixxMaster, released MIDI Space for iOS and Android. This is a free MIDI visualizer that lets you see your MIDI in a 3D rendering. The iOS version includes Audiobus support.
MIDI Space App Store Description:MIDI Space renders your MIDI music into an animated 3D scene. Each note is represented as a 3D bar, with color and Z-position based on the instrument. The app makes it quick and easy to switch between 6 different camera angles. Pan and pinch the screen to adjust the camera position. Long press to show or hide the button controls. Easily connect any MIDI controller/instrument or MIDI port using Core Midi or Audiobus. Open and play any general MIDI (.mid) file from your device or cloud. MIDI Space even allows you to control the camera angle and position directly from your controller/instrument!
Customize your 3D scene using the following settings:
- note names
- star background
- beat lines
- blue background
- show animated pitch bends
- show note velocity
- Use configurable CC's from your MIDI controller to change camera angles and/or zoom
Here's an official video that does a great job of showing off the complexity in the Simpson's theme.