I’ve just replaced my AV amp (an old DENON AVR1905 AV amp with a Marantz NR1604) and need some assistance with the set up. Using the front speaker pre-outs I’ve hooked up my Cambridge Audio Azur 640A to drive the front speakers, but the problem is that the Cambridge and Marantz remotes use the same codes, so as soon as I adjust the volume (with either remote), the levels of the front speakers go out of proportion with the rest of the system (this didn’t happen with the Denon). Any ideas how I can get these 2 amps to work together?