Simple sinewave synthesizer triggered by an ordinary 12x9 step sequencer.
Similar to TONEMATRIX: http://lab.andre-michelle.com/tonematrix
Shamefully based on it, actually...
Bevoc hooked me into this...
Just click or drag the finger to use.
Left/right/up/down to clear the screen.
Enter to exit.
Source-code in Flash CS3 included.
No Widescreen support, sorry (it works, just not fullscreen).