It's actually called a Spluffer (splitter/buffer) but I didn't build it as a splitter. Buffer only. I don't remember the details of it's inner workings but it basically adds warmth to piezo pickups. No controls, just input and output. If you have a hifi setup I wouldn't recommend it. For Peavy, Hartke, GK etc it would work well. Runs on two 9v batteries. I'm asking $25 plus shipping. I have a Clarus so I don't need it anymore.