Oh boi...
Where do I start here?
One part of me just wants to not tell you what this does so you can have a pleasant surprise.
But that would be bad marketing...
It does fuzz.
A lot of it.
It also does some envelopey oscillating weirdness that I can't explain.
Psychadelic funfunfun!!!
I am not sure if this explanation was helpful...
You can also get this as a kit from Musiking here
If you really wanna know how it sounds you could search for the Tim Escobedo Ugly Face.
Oh and "Backpfeifengesicht" is the german word for a face that you just want to slap.
It's a beautiful word and definitely a highlight of the german language.