The Seymour Duncan Studio Bass Compressor dresses up a staple effect on a bassist's board with a nuanced construction and premium components for that sustain and punch needed in the low end. Easy to use, the pedal features controls for blend, level, attack, and compression. Attack gives you that plucky pick presence while the compression knob dramatically shifts the dynamic range, and along with the Mid/Low frequency range switch, you've got an immensely versatile effect on your hands.