The thought occurred to me that I would create my own 6.1 mix from mix 7.1. But there is a consideration of how to make one of the two discrete side channels (the rear center channel) into what happens in those two discrete channels. Another option occurred to me, to make a 6.1 channel from Dolby Atmos. That is, the Atmos channel would somehow be mixed into the back center of 6.1, so that the information contained in Atmos would not be missing from the recording. The goal of these things is to make Atmos and 7.1 a mix of 6.1, which is better than 5.1. What do you think about it? ;-)