The electro harmonix deluxe big muff pedal takes the iconic big muff pedal and expands on its capabilities for even more versatility. It features the familiar sustain tone and volume controls from the original device to shape your overall distortion tone and it adds in new mid controls alongside a noise gate to remove unwanted hum. The upgrades take the original big muff design and gives it a whole new lease of life delivering greatly expanded sonic capabilities to experiment with and find your new signature tone. Instantly elevate your low end power with the bass boost switch and to really fine tune your sound control the resonance of your mids with the q switch. The expression pedal input also gives you the ability with the use of an external expression controller to remotely sweep your mid frequencies and gain new wah like effects. Basically a bigger bug muff.