Tone Matrix by André Michelle
With a similar concept as the Tenori-On by Yamaha the Tone Matrix is this nifty audio visual Flash App by André Michelle, a flash designer and programmer from germany. The Tone Matrix is a simple visual sinewave synthesizer with 16 steps for tone pitch triggered by an ordinary 16 step sequencer, based on the AudioTool engine by hobnox.
Each triggered step causes a force on the underlaying wave-map, which makes it more cute. If you add a lot of steps/dots the visual effect will be very strong and addictive!
Find the tone matrix grid synthesizer and other sweet projects (tone wheels!) at http://lab.andre-michelle.com/tonematrix