personally i don't like any of the mids pots i've used on a lot of the modded muffs, but the mids switch i fee does wonders. i was thinking, why not do a cap blend in place of the venerable mids switch.
I'm using a switch now and it does work very well but I thought I'd like to have a little more control over it, like in the LSTR. I haven't been building too much lately so I was looking for something little to do and get back into it. I tried adding a cap blend to a Fuzz Face and it didn't work out to well but I thought it worked great in the Doomidrive.
if you're happy with the mid pot of the LSTR, which is a muff variant like the pharaoh, why not look at the schematic and make the changes to the russian green muff? i've got a real pharaoh, and while it's nice, i find the mids pot to be less useful/impactful as the mids switch. which is why i prefer the mids switch.
silver - i'm sure it's not a new idea, but i tend to have some good ones every now and again. travis has heard so many that usually start off with "i have a stupid idea, what do you think about....." usually he tells me they're great, but i never do anything about them. so many circuit ideas i should actually work on that never do. one day.... lol
pasted some tone stacks from KitRae's site. I was going to also recommend the Supercollider if you like the Green Russian with more control. If you want to mod an existing pedal, then a mid switch that makes the scoop a little less drastic, yet not fully flat is a good way to go.