[Luke M]

After reading for hours here I think I have a solution to my TrueHD passthrough settings. Can anyone confirm for me if I set:
Speakers to 5.1 (I don't have 7)
Turn off transcoding.
Turn off Dolby and DTS buttons too.
It will send PCM to my Denon x3300 receiver of 5.1 TrueHD? Or do I need to set 7.1 even though I don't have 7 speakers?

Also, later this year I'm adding Atmos speakers, is there a way to get Kodi to output PCM for Atmos?

 Either 5.1 or 7.1 Kodi setting will work (assuming you have a 7.1 AVR with 5.1 speakers). If you have a 7.1 AVR with 7.1 speakers, you should select 5.1 only, because 7.1 is messed up on the FireTV sticks (side/rear channels are reversed). Hope that isn't too confusing. :-)

There are impediments to decoding Atmos. No open source decoder exists. No AVR accepts PCM beyond 7.1. So, it's not possible right now.