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From the Jim Dunlop website:

The Analog Chorus creates classically lush, liquid textures with Rate, Level, Depth, High, and Low controls for superior control over your sound.

This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included).

Analog Chorus uses bucket-brigade circuitry to create classically lush, liquid textures that you just can't get with digital circuitry. Rate, Level, and Depth controls, as well as knobs for cutting High and Low frequencies allow ultimate tone control. Like all MXR pedals, the Analog Chorus comes in a heavy-duty housing with durable jacks and switches for a lifetime on the road.