This is an interactive chord synthesizer developed using the minim library.
You can use this to try out chord progressions using a single click of the mouse. Have a play!
Click on the squares on the grid to play new chords; a left-click gives a major chord, a right-click a minor chord.
The waveform is shown too.
If you're wondering where the name comes from, google 'tonnetz' (german for 'tone network').
It's fairly basic at the moment. I'm sure there are lots of improvements that can be made to improve the musical quality...