I would like to put a proper IR expansion block rather than deal with this antiquated method of IR blasting.
The brain has an IR port out for it's little extension cable, I would like to put a cable from that to a IR expansion block and put IR Transmitters directly onto my devices.
Is there any documentation on the pinout of the IR output of the brain so I can rig this up?
Please check attached picture how the IR Extender is connected. Can you explain a little more in detail, how your "IR expansion block" looks like? Depending on your IR Expanders, you can hook up 6-7 LEDs in series. Or you can put them in parallel but then, they will share the current from the constant current source and emit less light.