This is a onecontrol AIAB pedal that emulates the acoustic360. It has a powerful sound with a booming low end that distorts with a buzz. Personally, I imagine Led Zeppelin more than Jaco Pastorius with it (though maybe you could create a Jaco-like vibe if you use it well?). I apologize, but there is Velcro attached to the back. The scratches are not very noticeable, but there are scratches (and dirt?) on the back cover.