Special unit only. This is an early model of the Special version, which was produced after the 250th unit, which was built with particularly good parts. VIVACE tends to be difficult to handle due to its unique bulging bottom, but the Special's bottom doesn't overreact, and it responds well to nuances in your playing, making it easy to control. It's a pedal with amazing three-dimensional sound. The image is that you can control the distortion of overtones with the nuances of your picking, offering excellent operability. The right knob adjusts overtones, and the Special's effect is more noticeable than the standard Vivace, so please try it. (There's a very useful point if you get the hang of it, and I'll give you a lecture if you don't understand.) We will ship within the scheduled period.