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Thanks for the clarification! I was initially confused because of the checkbox hierarchy; I thought I would have to include the 7.1 track in order to get the nested 5.1 track. But I guess they just structure it this way so you can tell which track is which...

Thanks again.

Hello, I have noticed that several of my Blu-Rays with Dolby Atmos tracks have a Dolby Digital 5.1 track nested under the Atmos track as well as an additional DD 5.1 track. My usual rule of thumb is the save the best quality 5.1 track available, but I can't tell what the difference is between these....