The Boss GEB-7 Bass Equalizer Pedal is compact in size but features a wide frequency range — from 50Hz all the way up to 10kHz. It has 7 sliders, 3 of which cover the critical midrange (400Hz, 500Hz, and 800Hz) where the character of the bass sound is determined. Each slider on the Boss GEB-7 equalizer pedal boosts or cuts over a +/-15dB range, allowing for substantial tone-shaping capability. EC. -ON HOLD!