Interesting, thanks. With a 5.0 flac, @JimKnopf got 3/2.1 on his AVR. Can you try a 5.0 flac, please, and remind us what AVR you have?
A clip from that Sense & Sensibility file would be useful as well for further testing.
No. Were you expecting any GUI changes?
I donāt have any 5.0 Flac files. My AVR is a Marantz NR1603.
Easy to snip out a chapter for you, where should I post it?
Try GitHub - sfiera/flac-test-files: FLAC test files for multi-channel sound systems
Dropbox or similar? Have mercy on my ābroadbandā, a 15sec clip will do!
https://www.dropbox.com/s/z7set5kur8jeuo2/Sense%20and%20Sensibility-001.mkv?dl=0
Can you confirm when downloaded and Iāll remove.
Got it thanks.
Just tried a 5.0 FLAC and my AVR thinks itās getting 7.1.
All is good, same behavior like on my AVR. I did a mistake when posting in internal chat among the mods.
Tried the upgrade to the test kernelā¦ Put the line into the sources.list (and saved with ctrl+x and y), ran the command - everything like always - , but it outputs only this:
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
And after the reboot the kernel version is still: Linux osmc 3.14.29-51-osmcā¦ Whatās happening here? 
Any ideas how to force the upgrade to the test kernel - as the sudo apt-get update && sudo apt-get dist-upgrade && reboot with deb http://apt.osmc.tv stretch-devel main added to /etc/apt/sources.list doesnāt seem to work here for some reason?
I saw something like this when I updated this morning ahead of testing the 5.0 file I referred to earlier.
Which kernel version is shown when you run uname -a?
I get Linux osmc 3.14.29-51-osmc #1 SMP Tue Jan 2 09:35:33 UTC 2018 aarch64 GNU/Linux
Short log: https://paste.osmc.tv/jokayuwiyo
Linux osmc 3.14.29-57-osmc #1 SMP Wed Feb 14 23:32:25 UTC 2018 aarch64 GNU/Linux
So given the date I gues no update has been applied, hence no extension of audio channel layouts via PCM.
though perhaps thatās a build date, not an install date, so I need to defer to others to interpret this.
Thatās the kernel version. Wed Feb 14 23:32:25 is the release date and time. 3.14.29-51 would be the current stable version, released on Tue Jan 2 09:35:33.
Tried a manual reinstall of 3.14.29-57 now. It seems 3.14.29-57 was correctly installed before (I seem to have left the devel source in my sources.list) and had it downgraded to 3.14.29-51 when deleting the line and running sudo apt-get update && sudo apt-get dist-upgrade && reboot againā¦ I donāt know. A bit of confusion here. 
sudo apt-get install --reinstall vero364-image-3.14.29-57-osmc did the trick. Iām on Linux osmc 3.14.29-57-osmc #1 SMP Wed Feb 14 23:32:25 UTC 2018 aarch64 GNU/Linux now 
Will begin testing shortlyā¦
WAIT! I think thereās something missing in the build in stretch-devel. I can get it working properly with flac 5.0 and the Sense & Sensibility clip using a mediacenter deb @sam_nazarko sent me but it looks like the published version is different in some way.
Ok 
Let us know, as soon as thereāre news. Or can you maybe send us that mediacenter deb, you got from Sam?
Letās let Sam check it so everyone is testing the same thing.
Which kernel version and mediacenter version are you running which gave you somewhat different 5.0 FLAC test results than others here?
Itās in internal version package which was not published at all. With current
vero3 kernel 3.14.29-57
mediacenter 17.6.0-25
you only have the first patch available which maps 5.1 channel audio to PCM 5.1 or better 3/2.1.
Sorry folks for this confusion, the developers have to fiddle out what went wrong when the actual development stretch was published. Please, wait for news.
Eagerly waiting 
There is no updated kernel as part of this testing; but you may receive one from other improvements made in the staging repository.
It looks like I forgot to bump the version properly. Iāve done this now and kicked off a build, so the improvements should be available shortly in 30-45 minutes.
Sam