On the XMC-1 I'm not sure you're going to be able to run REW "as it sits" or that you'll be able to run it to test all seven channels together and give you a ready-made set of filters.
I don't know if this has changed... but, as I recall...
Depending on your computer REW may or may not output all of the channels... or save the separate filters for each under the correct names...
This means that you will need to run REW separately for each channel, save the filter for that channel, then change the file name of the filter, and the field names IN the filter, to go with that channel.
So, for example, you run REW, save "the XMC-1 filter", then rename the filter FILE with the right name for the channel you ran, and edit the field INSIDE the file to say the right channel name.
The filter files are just text files... and there is a separate one for each channel.
You can do an EXPORT FILTERS from the processor first...
That way you will be able to see what the files should be named and the proper label names to put inside them.
(There is several pages of detail about this in the manual.)
Basically, the filter for each channel has a different name...
And, INSIDE THE FILE, there is also at least one field that contains the "channel name".
(The files are just XML files which can be edited with a text editor like Notepad.)
THE IMPORTANT THING TO REMEMBER is that what you are calibrating are your speakers, your room, and the speaker placement in the room.
You DO NOT need to calibrate the individual channels on the processor, or on your amps if they're modern, because both of those will be "arbitrarily perfect".
So, rather than worry about getting your computer to output the correct channels, you can simply use one channel on the processor.
So, for example, test the RIGHT FRONT channel first, and save that filter...
Then plug the interconnect from the LEFT FRONT channel of the amp to the same RIGHT FRONT output on the processor and run it again.
And this time save it as the LEFT FRONT FILTER.
Just plug the interconnects going to each additional channel on the amp into that same output on the processor - one after the other.
And, for each channel, save the filter file you get with a different and appropriate name.
Depending on your computer and sound card you MIGHT be able to convince REW to send the outputs to the correct channels...
But, as I said above, that is not strictly necessary, and it may be simpler just to keep using one channel on the processor, and "walk the amplifier inputs across it".
And, since the channels on most amplifiers will also be identical, in terms of room correction, you could even connect each speaker, one after the other, to the same AMPLIFIER output.
Thanks for the update. So I did download the REW software and started the process. I watched some videos and thought I have it pretty well figured out on how to get the readings. I do run into a strange issue. When I first set it up I used the internal filters and set everything to 75 DB and applied the distance. in those tests everything sets the tone to the proper speakers. However, using REW set to 7.1 doesn't fire properly. Like when setting subs it fired my right front speaker. One of the rear speakers in the software fired the center. Has anyone else had this happen?