Features: Analog chorus module specially designed for using with BIYANG LiveMaster Series modules mainframe units LM-4/ LM-7/ LM-10.(mainframe units sold separately) Based by Boss CE-2, splits the input signal and adds slight pitch variations and recombines the signals, which can create subtle thickening effects. SPEED knob: to adjust the rate of the effect(how quickly it modulates); SPREAD knob: to adjust how much pitch fluctuation there is; FAST/SLOW toggle switch: to control the overall ensemble and speed of the chorus. Special spring locking design makes it easy to install and remove the module from the mainframe unit, flexible and convenient to use. Metal touch points design greatly reduces the noise from pedal linked cables and maintains the line signal intensity at the same time.