a 1990 DOD brochure
The FX40B Graphic Equalizer offers seven bands of 18dB boost/cut for frequency spectrum control in a very compact pedal. Use it for changing the tone of your sound or eliminating feedback.
The FX40B is a powerful sound-shaping tool. It is a seven band EQ with one band for every octave, 12 dB of boost or cut for every band, and a slide pot for controlling the overall level. The FX40B is a tried and true design.