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

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities