NU-X Drive Core Deluxe is a combined boost and overdrive pedal for clean to dirty guitar tones. 3 switchable modes are for clean boost, drive or mixed boost + drive. Clean boost can be used to push a guitar amplifier input into overload for a naturally saturated overdrive. The Drive mode generates its own overdrive from subtle to distorted and in mix mode, can be used with the boost to combine the best of both worlds. A single rotary tone control is joined by a bass boost when the Drive control is pressed. An all round drive monster for blues and rock tones. good condition and fully working