TonnetzViz is a web-based music visualizer that receives MIDI input and visualizes it in real time using the Tonnetz. It can also be controlled using the computer keyboard.

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The Tonnetz is a lattice diagram representing tonal space. It can be used to visualize harmonic relationships in music. Each node in the diagram corresponds to one of the 12 tones and is connected to 6 adjacent nodes. The 'neighbours' of each tone are related to it either by a third (major or minor), or by a perfect fifth, depending on their relative position in the diagram.

If your browser supports the Web MIDI API, you can use TonnetzViz with any MIDI-enabled instrument. Just connect it to your computer, go to the Controls tab in TonnetzViz, select the appropriate MIDI port and play. You can also connect TonnetzViz to a software sequencer using a virtual loopback MIDI port.

No MIDI support in your browser? Don't have a MIDI keyboard handy? You can use your computer's keyboard to control the app.

TonnetzViz also has a very simple synthesizer built-in (using the Web Audio API). You can turn it on in the Sound tab.

• Live version
• Videos on YouTube
• GitHub repository