When testing codes, don't use the volume keys to determine if it works or not, reason is the volume keys NEVER work initially with ANY audio code. Because the volume keys won't work at all without a tv code programmed to the tv device, once there is a tv code its volume is now in the way, but that can be remedied.
With tv code programmed in, try each denon code, test ALL keys with stereo on. If you come up partially working code, to get the volume:
1. av1 or av2