I spent today making this, for some reason. Then I realized there was a KOTM today. I am retroactively declaring this a KOTM project. It makes music. Illegal music. Diabolic music. Okay, by that I actually just mean there are tritones involved.

Source code: https://bitbucket.org/runhello/whoop

Decoder ring:

Click a ring to increase pitch by one semitone
Right-click (or shift-click) a ring to decrease pitch by one semitone
Ctrl-click a ring to disable or enable it
Left and right arrow keys to speed and slow the alternator
R key: Reset everything
B key: Reset alternator, leave notes unaffected
Number keys: Load notes: (1) Tritones (2) Tritones [shifted up 3] (3) Tritones [descending] (4) Tritones plus tritones shifted up 3 (5) Hum (6) Higher hum (7) High buzzing (8) Pentatonic scale (9) Major chord (0) Liz's chord

Mac and Windows versions included.