The Marantz A/V recievers typically need 2 setup codes in UEIC (URC and some RS) remotes in order to achieve all functions. With my SR-5300, I need to use the AMP 0189 and 0269 codes. The number buttons usually hold the device selections, and most functions are available with advanced codes (three digit codes that access functions that may not be mapped to a key).
For starters, put code 0269 on the AUD button.
Then try the buttons (all of them) to see what they do. If none of them perform the functions you need, try 0189 and see if any exist.
If you still don't get them, try
www.hifi-remote.com. Look under Advanced Code List and click the setup code you are using for a very detailed list of advanced codes.
If all else fails, then someone here may be able to give you the correct advanced codes (EFCs).