There was a Twitter post from I think earlier this year, though maybe last year, that showed Billy's acoustic tour pedal board, and on it was a Muffuletta, which is a pedal that includes the circuits for a bunch of different Big Muff versions, with those circuits being selectable via a knob.
http://pedals.thedelimagazine.com//w...etta-00031.jpg
I also bought one of those re-issue NYC Muffs that were being sold around then, and that one is pretty different sounding from the op-amp Muff that classic SP uses.
I put together a clone kit of the op-amp Muff, from BYOC:
https://buildyourownclone.com/produc...er-opamp-kit-1
I also custom added a mid-scoop toggle switch, which some of the originals had. It sounds very classic SP - more easily instantly so through a Les Paul with 490R / 498T pickups than through a strat. A lot of that thick-bodied sizzle and growl on the album is coming from the Les Paul humbuckers. And if wanting Billy's SD strat sound, then the Lace Sensors have to be set up the correct way. I might make a thread about that.
The Univox Superfuzz was also used a lot on SD, according to a couple people who worked on the album. One reference for that is here:
https://www.gearslutz.com/board/show...1&postcount=31
And there are a couple other places where it was mentioned, though I don't immediately recall where.
The MXR Distortion II was used together with an op-amp Muff for solos, according to Billy's "stompland" pedal video.