I've finished testing phase of adding MRX1 and CCP for iOS to my configuration. The problem (to this point and it is the only ones I've tested) is that the URC Serial code database for Russound CAV6.6 [ZONE 1] (Setup number 680) and [ZONE 5] (Setup number 1038) have incorrect entries for Vol +, Vol -, and Mute.

I extracted MSC400 serial entries obtained direct from Russound and copied over the bad entries and it works as expected.

Not looking for help ... just wanted to point it out. Although if someone has more information or there is more to this situation than meets the novice eye -- let me know.