I will post my settings here in case it helps, 7.1 channel audio works for me in general with KODI 17 RC3:
1. MY KODI version is 17 RC3, which is the version that Q10pro updates to after installing Android 7 (either firmware 2.0 or 2.0.1 it doesn't matter).
2. Wrapper is set to HiMedia Player not KODI !
3. Go to System Settings in KODI and select expert mode (in the lower left corner of system settings, by default you will see basic mode, click twice : first for ADVANCE mode, second for EXPERT mode) , in that way you will be able to see all the AUDIO features needed to change.
4. Go to AUDIO settings, then change the following:
a) Change to ON :
- Audio Passtrough
- AC3 capable receiver
-DOLBY TRUE-HD capable receiver
-DTS-HD capable receiver
b) CHANGE (or KEEP) to "OFF" :
- AC3 decoding
Remember if you have 5.1 or 7.1 DOLBY and DTS AV Home Cinema then you should send the audio signal RAW , meaning the AV RECEIVER has to do the decoding, not KODI !
5. Also in Q10 Pro Android Settings, go to audio and change the 3 options to RAW; RAW and RAW 7.1 (if you have a 7.1 receiver, otherwise just RAW)
6. Do not forget that if you are using and HDMI 1.3 or higher (preferable HDMI 1.4 or better a 2.0a cable) you will be able to get 7.1 channel output, otherwise if you are using digital SPDF out audio cable, then you will only get 5.1 (Dolgy Digital and DTS) output but NOT DOLBY TRUE-HD OR DTS-HD 7.1 OUTPUT.
These settings works for me. I am using an HDMi 2.0a cable and a Pioneer 7.1 Home cinema AV receiver.