To set the string in motion, click "Center Pluck" or "Fundamental", or click on the string.
Below the function you will see a graph showing each normal mode's contribution to the string's vibration. There are two sets of bars; on top are the magnitude bars, which shows the amplitude of each normal mode. These bars can be adjusted with the mouse, or you could double-click on one to isolate a particular mode.
This version of the applet has no sound. Here is the version which has sound.
