XBOX ONE Audio - 5.1 Surround Sound - WHERE IS IT FOR CABLE???

I have the same issue with my Xbox. If it is connected via HDMI the 5.1 sound will rarely work going to my surround sound receiver regardless of what the settings are in the Xbox but if I connect it using an optical audio cable the 5.1 works without fail.

The Xbox is an Arcade edition.

From the Kotaku review:

The units we've been testing mess with the audio that comes from the cable box, and are currently only able to output surround sound if you dig into the menus and tick off a "Surround Sound (BETA)" option. Otherwise, it downmixes your cable's 5.1 surround
to stereo. My boss Stephen Totilo likes to watch pro wrestling, and when he does, he likes to watch it in surround sound. (The better to hear the taunts and the body-slams, I guess.) But if he runs his cable box through his Xbox One, the audio comes through
in mere stereo. Microsoft assures us that a non-beta option for surround audio throughput is coming, but it won't be there at launch.

I hope it doesn't take too long...

I have a 5.1 dolby digital receiver/dvd player hooked to xbox one with an optical cable and to the tv with hdmi Xbox setting is set to bitstream out dolby digital and I get full 5.1 on games and blue ray works perfectly and menu sounds but any music or
video app or a dvd that has 5.1 audio won't work the music and video apps only give 2.1 and the dvd with 5.1 sounds so muffled I can't hear I have tried everything and all I can get is this or fake surround and I don't want fake surround if all the apps are
in 2.1 why wouldn't the Xbox be smart enough to mix the sound through all the channels of audio if the program only does 2.1

Setup is here:
support.xbox.com/.../connect-console-to-home-theater

Go here:
support.xbox.com/.../poor-audio-or-sound-quality

Audio settings are here:

support.xbox.com/.../configure-audio-settings

***surround sound may be limited to a set top cable box...as I tested my PC which does send a 5.1 signal and the Xbox one is not able to decide from my PC to hdmi out of the Xbox one to the stereo. My cable box does send surround sound depending on the
channel.

First, try going to Settings > Display and Sound > In the middle, change the "HDMI Audio" setting to '5.1 uncompressed'.

If you still can't get 5.1 audio to your sound system, try buying an optical audio cable and plug that from the back of your xbox one into your sound system and change the settings on your sound system to use the 'Optical In' or a setting that chooses that
input. Don't forget to change the settings like the one above, but under "Optical Audio" choose "Bitstream Out" and change "Bitstream Format" to "DTS Digital Surround." The optical audio port is right between the HDMI in and out ports.

For more info see this page:
support.xbox.com/.../configure-audio-settings