Similar sort of vein as the Diefet, but this time based on the Bogner Ecstasy. It's a 9V circuit, but I thought it would again be worth including a charge pump with this and so have added the small daughterboard to allow you to supply it with 18V (or either 9V or 18V if you want to add an extra toggle switch).
The boost switch is intended to be a second stomp and so you just need a SPST, but can use a double pole if you want LED indication.
Here's the vids:
and a comparison vid between the Goosoniqueworx Seventheaven and the Bogner Ecstasy Red