I purchased this used and incorporated it into my pedalboard, using it several times. However, I'm selling it because I've replaced the board. Currently, there's no crackling, and the effect functions normally. I'm a novice, so I don't know much about the technical aspects. I will respond to comments to the best of my ability. Please understand the above before purchasing. This is a noise gate effect pedal with a white, compact design. - Model Name: Noise Gate - Color: White - Input Jacks: 1/4 inch jack - Output Jacks: 1/4 inch jack - Controls: Sensitivity knob Thank you for looking.