I'd be surprised if you'd have issues until way more than three connections although it may depend a lot on the modules and the initial voltage - voltage droop is not that significant - and trigger inputs are usually triggered by any signal over a certain voltage... sometimes this quite low, sometimes it is quite high - so ordering of the stackcable chain may have an impact

don't stack more than 2 though chain them - less stress on the sockets
-- JimHowell1970

So when you say 'chain' them, do you mean chain the input that is clocking a module and stack that input to the input of another module? Right now I have one cable stacked to the output from my clock out on my Hydrasynth...one goes to Maths and one goes to my Ornament and Crime currently...I could stack from the input on my Maths and go to say input on Quadrax?

JB