Just a nudge in the right direction for those that want help with IR codes...

Regarding Denon...
All of the available codes are posted on the Denon CI site in a cryptic form but the info can be used with a third party tool that was created by Robert Wilson to generate specific codes. The link to this tool is below.
Denon Pronto Hex Generator

Regarding the concepts behind the Denon Hex Generator and interpreting the data posted by Denon, look HERE and find post#8. Most of this info should be credited to johnsfine and StephanPM (see HERE for a similar post on denon codes)

Analyze IR codes yourself...
IRTool Modified and DecodeIR.DLL

Generate IR codes yourself based on info discovered with IRTool...
MakeHex There is a GUI interface now... find it HERE
Search MakeHex posts by johnsfine for more info. I am not sure if this is the most current version or not.

Regarding RC5 codes...
RC5 to Hex converter tool

Barry Gordon's article on the pronto Hex format...
HERE