This Digitech Studio Quad 4 has been tested and works properly. Comes with power supply. Please check pics for condition. Thanks for looking. Quad4 is a multi-effects processor that is multi- talented, and whilemost of us can't do more than one thing at a time, the Quad4 can do 4.Why did we put the power of 4 multi-effects processors into one unit? So you, too, would be able to do more than one thing at a time. The Quad4features 4 completely independent inputs and outputs that give you thepower of four independent mono processors or two true stereo processors.Imagine the power to process two true stereo sources simultaneouslywithout sacrificing control.
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