About Ref. input and Ref. output

[Lba]

Hi everyone!
I'm measuring Ambisonic plugins via REW. I'm using the program's measurement system, sending the signal to Reaper via a virtual cable, and it returns via a virtual cable.

Currently, I'm using two channels, but I don't understand the reference input and reference output channels. I have to specify them, but there's no signal other than what the program sends to Reaper.

What would be the optimal configuration in this case?

Thanks for the help!

 

[John Mulcahy]

If you aren't using a timing reference it doesn't matter what they are set to.