With this pcb you can build one of a total of 10 different Muff versions.
You get full technical support at the GuitarPCB.com forum, membership is free of course! There is even more detailed build information available there:
Here´s the website for this project, only available when you are registered at the forum:
Here´s the direct link to the building docs, including layout and schematic:
Here you can find demos for nearly all GuitarPCB projects: