The XX Double Shot has been my first build. But I modified it with a switch so I can select wether Boost II receives 100% of the volume from Boost I or only the adjusted. The wiring looks very chaotic, but by now I use always your 3PDT wiring boards.
I´ve done this built in september 2017. It drives the amp into a super crunchy sound and I play a Sound City 200 Plus Mark IV Custom Build with 4 original GEC KT88 that normaly must be played ultraload before it becomes crunchy. That´s saying something.
If I see all the cool designs here, my one makes me ashamed.