cascading

[nash]

with a russian and a usa big muff's

is it literally both on one after the other in terms of signal chain? does it work better with identical settings or deifferent?
also the russian is true bypass and usa buffered which one should go first ie bass-muff1-muff2-amp

[cheddatom]

With only two possibilities to try, it really would be quicker to just set them up, and listen to the differences when you swap them around. Use the order that sounds best to your ears in your opinion.

[Ant]

stacking up gain is a great way to get some meaty thick sounds, i've found that people always say certain things should always go in a certain order, but you may find you prefer the sounds of a totally different signal chain - just sit on your floor for ages switching everything around and see what sounds best to you.

I love the sound of my tech21 comptortion driving my cranetortoise DD-1B but it sounds totally different the other way round (even though you can get similar sounds from both pedals)