The word "device" has multiple meanings in the IR world, so it is confusing. The remote has 4 pages of setup codes (cable/sat, audio, video, and TV). Pressing a device button selects the type of code page. Setup code 1234 carries different information in the audio page versus the video page, and generates different command codes when an ordinary button is pressed. But there are really only 4 types. For example DVD and VCR are both video types.

The Lookup Tool give you a list of setup codes; however only the first 5 on the list are actually built into the Cinema 7. The leftmost two columns are Access Method and Type. You can see that the first 4 are RCV or CD and the Type is audio. So those setup codes should be assigned to the RCVR or CD device buttons. Either is OK. Setup code 0076 is VCR/video and should be assigned to VCR or DVD/LD.

Those first 5 are the only setup codes which are useful to you--the rest are listed as n/a for the Cinema 7. There are about 45 buttons on your remote (other than the device buttons) and if checking for a response takes 5 seconds per button, then you should be able to check one setup code in about 4 minutes, or about 20 minutes for the whole exercise. If you don't get any response, then I think the odds of finding a response using the setup code for a non-Denon protocol are pretty poor, although not zero. Or you could try typing in all 256 EFCs for each of the 5 setup codes, but I wouldn't....