Wah filter. Half-wah is possible. Discontinued product, Comes with the box. For those looking for one, please take it. B'z DED END Michael Schenker If you're covering those, it's perfect! Please check the sound on YouTube! Instant purchase ○ It's that sound of Mr. Matsumoto. Previously, there was only this or the red BOSS one. I think it's easier to use than FIXED WAH.