Partly inspired by South Indian carnatic music, Strudel now has some experimental 'stepwise' functionality, for combining and transforming patterns based their 'pace' or number of steps per cycle. Details are documented here:
Stepwise patterning 
Strudel
Also coming to the next Tidal release soon!
playing around with it a little, not quite sure what is going on here:
sound("bd sd cp".stack("hh hh")).pace(4)
is it taking the lcm of the steps of the stacked patterns and adjusting those steps to 4 per cycle? i guess i expected each individual pattern to be aligned in the 4 steps per cycle grid
Yes that's right, "bd sd cp" has a count of 3, "hh hh" has a count of two, so "bd sd cp, hh hh" has a count of the lcm, of 6.