I'm looking at Robb's diagram though, and thinking it is not necessary to run a separate "+" wire to each MR16 in the cannon, right? i.e. only one "+" is needed for all the reds which would be controlled by channel one (with a resistor at each MR16 bulb?)
In other words if a cannon has three colors (regardless of the number of MR16's on each color) and you're using 4-conductor cable, you would use a common "+" wire for all the MR16's in the cannon, and a discreet "-" wire for each group of MR16's of the same color that you want to control as a set (provided your cable supports the current required.)
Unless of course you want to control EACH MR16 in the cannon individually, which is why kylec asked that question Robb...
Correct me if made any misstatement here, as I need to understand too.
John