Audio help

This is very frustrating because I have a large library of DTS music.
When using other HTTP setups I have always had correct DTS playback. “boxee,” Microsoft media….etc.
I moved to XBMC which became “KODI” because it is the best except for Music DTS playback…………..video “movies” are fine, so is bluray music playback.
I have read and reread all the wiki pages, I have searched and read all threads concerning DTS audio playback with no success.

My setup:
I have a networked Lenovo Q190 running Windows 10 connected by HDMI to a Pioneer Elite sc-57 receiver.
The speaker setup is 5.1 (4 towers, a center and a subwoofer)
When I play bluray audio or a movie with multi-channel sound I set my Pioneer to auto detect surround sound and it works correctly.

So that I can listen to my DTS music files sitting on one of my hard drives.
What would be the correct KODI Setting on settings page:

SETTING> SYSTEM> AUDIO>: ?

Thank you in advance I have been trying to fix this issue for several years without success and after I saw another suggestion today I tried it………with no luck.

This is discouraging………………