A simple assembly of a stompbox with tone and volume that I made with a box of laguiole knives that dragged and recovery material.
A nice little box for acoustic parties.
the only thing I did not have was the piezo disc.
For the values of potentiomtres I took old knobs of guitars, there is surely a better choice than the 500 k but it works.
Thats cool! I've always planned to build a noise box using piezos inspired by this Scrap Yard video. He's doing cool stuff with it: demo Have the parts lying around but never got around to do it... thanks for reminding me!
I thought about integrating a simple delay and/or fuzz as well...
EDIT: piezos are super cheap on ebay