[LeKnain]

Hi everybody !

First post here so :
=> Thank you all for all your work on making XBMC as great as it is !!
=> Sorry for my english as I'm not an native english speaker !

Anyway, I'm not sure it is the right thread to post but here it goes :

I recently installed a full XBMC setup on my NUC (Haswell i5) with OPENElec (last Gotham Nightly if I'm not mistaken).
For the record my setup is quite classic : NUC > (HDMI) > AVR/5.1 > (HDMI) > TV

Before posting a debug log (I don't know how to do it but I'll learn if necessary), I wanted to know if my setup behaviour was as intended.

When I choose :

1)
HDMI (AVR)
Speaker Config : 5.1
Audio Output : Best Match or Optimized
My reciever capabilities/Passthrough : ok
==> When playing movies/Video files, I get the right sound out of my NUC to my reciever as DTS/whatever without any issues (Tried FLAC, DTS HD etc.. all seems to be working)
but... => I get no GUI/Menu sound and TvTunes (Mp3 Files) can't be heard.

2)
HDMI (AVR)
Speaker Config : 5.1
Audio Output : Fixed
==> When playing movies/Video files, I get the right sound out of my NUC to my reciever as PCM
=> I get GUI/Menu sound and TvTunes (Mp3 Files) sound as 5.1 (native stereo I guess)

3)
HDMI (AVR)
Speaker Config : 2.0
Audio Output : Best Match or Optimized
My reciever capabilities/Passthrough : ok
==> When playing movies/Video files, I get the right sound out of my NUC to my reciever as DTS/whatever without any issues (Tried FLAC 5.1, DTS HD etc.. all seems to be working) which is normal since it is Passthrouh and the Speaker Config only affects PCM and not passthrough)
=> I get GUI/Menu sound and TvTunes (Mp3 Files) sound as 2.0

So my questions :
A. Is it intended that I have to put my speaker to 2.0 (instead of 5.1) to get the GUI sound while having Passthrough activated?
B. [Pure hypothesis] What happens when XBMC can't bitstream a 5.1 File to my reciever and have to decode it to PCM first, will it be downsize to 2.0 instead of 5.1 LPCM?

(I don't know if it is related but I remember on my first setup I had a DvD Player on which I could only hear the secundary audio (IME, PIP..) while Pure Direct (Birstream/Passthrough) was deactivated)

I'm not sure I'm clear but well thank you anyway !!