Thanks, so using a TS splitter, then connecting the TRS cables from the splitter to the 2 devices I wish to control, should work and not cause any damage?

As an aside: when controlling the 8 step with an expression pedal and the 8 step is synced to midi clock, if the expression pedal parameter is set to control the rate, what happens/should happen?
Should the tempo follow some division of the tap divide or the rate slider and is there any way to control the rate via expression pedal input, that is a division/multiple of the incoming clock’s tempo?