What Keeley should be doing is coming up with a new take on the Tube Screamer, that's what the world really needs — a good take on the Tube Screamer that's unlike any Tube Screamer before it.
Following the progress on this one from a safe distance.
I mean it would probably be easier to build workaround circuits that don't include a bunch of digital switching, but that's not your job obviously.
I do keep thinking about making ones of these that is switchable between basically DS-1, SD-9, Rat and in-between modes, which would make sense and be feasible using toggles and making some compromises with the knob tapers.
I wouldn't be against a project with digital switching, but unless we used all SMD it'd most likely have to be stacked PCBs... One loaded down with digital switches and the other with the actual signal path(s).
I haven't even begun tracing this one, but the dual gang pots give me the impression that it's switching entire stages, not reconfiguring them by swapping component values. I don't have the pedal in front of me right now, but it seems like the tone pot is a B25K / W20K dual gang pot, which obviously isn't very common.