I have a Yamaha RX-V1800 and a Harmony 520 learning remote. I was able to get the extended IR codes from Yamaha for both the "Adaptive DRC" and "Adaptive DSP" on/off commands. The custom code is always 7E but the data codes are now 4 Hex digits as opposed to the nominal 2 Hex digits of the other extended codes. The remote that comes with the Yamaha only displays 4 hex digits How do I get the Harmony520 to learn these commands? Is it even possible?