Click to flash movie to set browser focus, then try out the following controls (not case sensitive):

F - toggle field blur
B - toggle particle blur
R - reset original number of particles
shift toggle show/hide dots
up arrow - bigger particles
down arrow - smaller particles
right arrow - faster motion
left arrow - slower motion (to reverse)
1 through 9 - set color range
0 - clear color range
< - less blur (longer trails)
> - more blur (shorter trails)
plus - more particles
minus - fewer particles
space bar - redraw with current settings
m - toggle microphone pickup, if you have a mic available (defaults off)
[ - decrease microphone effect
] - increase microphone effect