I purchased this last year and used it to make sound 2-3 times before storing it. I made an impulse buy because it was such a great item, but I haven't had a chance to use it, so I'm putting it up for sale, hoping to pass it on to someone who wants it. It's extremely rare, and the sound quality is excellent. You can get a beautiful, bell-like tone by rolling back the volume on a Stratocaster. I believe the middle knob is for bias adjustment. The toggle switch controls the thickness (depth?) of the gain. It can be used with both humbuckers and single-coil pickups. Please consider the items in the images and their condition as the entirety of the product. Also, the leather material around the footswitch has been dented during transportation. Other than that, it's in like-new condition with no scratches. I haven't attached any Velcro. The original box was not included when I purchased it new, so I will include a substitute box.