OK... here is what you do...

You must first have MakeHex and understand how to use it.
[Link: hifi-remote.com]

Marantx uses RC5 and RC5x protocol codes.

The commands on the excel chart you likely have contain data represented in decimal form by either two sets of double digits (RC5) or three sets (RC5x).

The first number set represents the device parameter (whole number) for both RC5 and RC5x.

The second set represents either the function number (for RC5) or the device sub-parameter (for RC5x)

The third set represents the function number for RC5x.

So...

Power On which is represented as 16 12 01 is RC5x device 16.12, function 1

DVD input which is represented as 16 00 10 is RC5x device 16, function 10 (no need to represent the zeros as far as I can tell)

Tuner 1 which is represented as 17 63 is RC5 device 17, function 63

In makehex simply open the folder, find the RC5 and RC5x .irp files, open them in a text editor (notepad is fine), edit the device number for the code set you want and then drag the modified .irp file onto the makehex application to generate a list of possible codes. You can then go through and assign function names to their associated function numbers from the documentation chart.

I can send you an excel template that I use that helps with the organization of the codes. I select ALL from the generated codes sheet, copy the list into the excel chart, use the find function to find all lines containing the word "device" in the code column, select all of the found cells in the find window, right click on one of the selected or found cells in the worksheet, click delete and move cells up. Once you have done this you will have a nice clean column of codes next to which you can enter the function names. When you create a new RTI library file first enter all the desired function names, then click the hex view tab and then click the apply check box. Now you can simply select the first entry in your new library file, go to your excel sheet, click on the cell containing the appropriate code and press ctrl C. The code will automatically copy into the library and drop down to the next function ready to copy another. This makes it very quick.

Shoot me an email if you have any questions. perhaps we can speak on the phone if needed.