Those are the 3 changers I am using with my setup. On the back of each unit is a command mode switch which allows you to select one of three different sets of IR commands for the changer to respond to. The remotes that come with these changers have the same command mode switch which can be found in the battery compartment. This functionality allows you to basically have 3 of these changers each with their own unique set of IR codes. You then just learn the codes off the remotes accordingly. Not sure if this is what you meant, but up to three of these changers work without any type of extended IR setup as you can set each changer to respond to its own unique set of IR commands. My .pcf file btw includes the full set of IR codes for all 3 command modes, including discrete power on and off IR codes for each as well.

-LP