Test Results Showing Operation

Unfortunately, we weren't able to get our equalizer to work -- it had some funky plugs, and besides that, it looked like some of the components were likely burned out. However, we did get a video of the mechanical interface in use.

And not to be discouraged by such unimportant things as a non-working system, we were able to locate another video by someone with a probably younger system, appropriately displaying its functionality.

Each slider corresponds to some frequency band. When the equalizer is turned off, the audio is ported straight through from IN to OUT. When it is turned on, a gain is applied to each frequency band, proportional to the slider's position. (In fact, the reason this is called a "graphic equalizer" is that the LEDs on the sliders resemble a plot of frequency against gain.)