Connecton my gemini to my stereo receiver audio

Right. The Gemini only has an HDMI output. No analog audio output. What sort of "stereo receiver" do you have? Does it have HDMI inputs.  If not, things get complicated. 

@MPG1, we want you to enjoy the best with your Gemini. The Gemini has different ports connections. In the back panel, you can find the HDMI port to connect it to the TV and the Digital Audio Port to connect the box to the sound system. For more information, visit: https://www.directv.com/support/satellite/article/000093364 DIRECTV is here for you. Laura, DIRECTV Community Specialist

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I purchased a digital audio to analog converter (https://www.amazon.com/dp/B00KNNSKV0) and connected it to the digital audio output at the back of my 2 Gemini devices. With both, when I then connected a headphone to the converter I just got garbled noise, which changed as I changed the channel so it seemed to be getting some kind of signal. I tested the converter with two other devices that had digital audio outputs (a Blu-ray player and a TV) and it worked fine. When I used a TV connected to the Gemini I got the same garbled noise if I was watching with the Gemini (although the speaker output was fine), but it was fine when watching a Blu-ray, so it was like whatever was coming out of the digital audio was not properly converting. Again, I tried two different Geminis and got the same problem.