This is an effects pedal purchased used. The item is only the main unit. Sound output has been confirmed. Currently, there is no scratchiness in the knobs. There are scratches and dirt. Please understand that there may be overlooked areas other than what is described and shown in the images. Please be sure to check the product in the images and purchase only if you are satisfied. Please refrain from purchasing if you are a perfectionist or overly concerned about the condition, as this is a used item. If you are not satisfied or have any concerns, please refrain from purchasing. Returns are not accepted.