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?

Phone or email Harmony tech support with this request. This will input the commands for you in short order. You will then need to update your remote.

++ harmony support should be able to help