If you need to connect the IR output of a Centro processor to a Wyrestorm matrix for transmission of the IR through the HDMI balun system, you cannot use the stereo-stereo cables which are supplied with the Centro.
Both the Centro IR outputs, and the Wyrestorm IR inputs have stereo sockets with 3 pins:
TIP: Pin1
RING: Pin2
SLEEVE: Pin3
At the Centro end, the pins required are the tip & the ring pins 1 & 2.
At the Wyrestorm IR RX end, the pins required are the ring and the sleeve pins 2 & 3.
Connect the Centro Pin1 to Wyrestorm Pin2, and connect Centro Pin2 to Wyrestorm Pin3. Connect nothing to Pin1 of the Wyrestorm plug.