Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How do you get audio from this unit to receiver? Optical cable and receiver input all tested with other sources and function properly.
Document: It beats having to buy an expensive yet obsolete stereo receiver. Which gets straight to the point of the task. * It comes with a remote so you don't need to touch it if it happens to be located far from your viewing or listening range. * It has two outputs so you're not limited to one monitor, which solves the lack of a split screen function on your TV or monitor. * It has a (SPDIF)Optical Output for 7.1 surround sound to any device with the same input.
This little box does what I got it to do; to switch HDMI video from initially two (now three and later four) sources, and to output video to an HDTV and a front projector. That it does well. And it also splits out digital audio via an optical audio port over to an AV multichannel receiver that lacks HDMI ports.
Later, after using the headphone jack for a while (which worked great), the optical port started working. For now, everything seems to work as advertised.Sometimes, it seems like it takes a little fumbling with the switch to get the input and output devices to hook up. One star deducted for that and the remote not able to control the unit power.
Sometimes, the lights on the display that are supposed to indicate that it recognizes an input do light up, but without displaying anything on the display. I haven't even begun to test the audio capabilities, because I cannot get the display matrix to work properly. Either this particular item is defective, or it is just very poorly engineered. It's going back.
This matrix saved me lots of $$$ on upgrade to 3D compatible A/V receiver. My objective was to share 4 HDMI sources:- Panasonic DMP&#8209;BDT500 3D Blu Ray player- PixelMagic MTV-7000 HD PVR- Sony PS3 console- Kdlinks HD700 3D networked multimedia playerbetween- Samsung LCDTV 55 (2D only)- Optoma HD8300 projector (2D/3D).I was hesitating to make the purchase being not sure if my 3D sources will switch properly.
I bought this because my home theatre only has two optical inputs and I need three. In addition, I figured it would let me more easily switch between devices. What actually happened was quite different. First, switching between audio modes is cumbersome. Then, when I would switch between devices I would almost always have to reset the unit or turn whatever device I was going to use off and on again to get the matrix to recognize it.
I purchased this product and the unit quit working properly after about 60 days they did replace the product but unfortunaly they did not remburse me for the dhipping costs would not rcomend this product they did replace it but it did cost me another 11 dollars to get a replacement.
So for example, if I want to play 3D movie from my Panasonic BD player on Oproma PJ while my 2D LCDTV is routed also to same Panasonic source, the player will not handshake 3D properly and will report there is no 3D display connected. Switching LCDTV to different input other than Panasonic player, solves the problem and watching 3D movie is possible. This is not a matrix limitation but natural way of switching HDMI inputs between multiple sources.
I bought this to share an single HDMI input into a projector system across multiple inputs (cable box, PS3, Xbox360) and feed the sound into an older stereo system. Also allow the use of headphones without having to rig a connection to the stereo system.It does what I bought it to do. It works well once it is going - but often requires a couple resets to get it to connect the sound to the stereo system, though once it is connected it works fine.
Pros: easy install, easy use, does what it's made forCons: not very good looking, very limited range remote, very slow switching, some inputs and outputs out the sides.Arrived, opened and ready for use in 10 minutes or less... this unit arrived with a non working input &#34;2&#34;. Everything else works great if very slow to switch. Ordered a replacement, will send this back as soon as I get the new one. Will update review.
Answer: The HDMI inputs outputs do carry audio signals.  In the simplest setup where all sources and monitors (I.e. TVs, receivers, etc) are HDMI capable, you won't need to worry about audio.  However, if your receiver is HDMI-less, then you have the choices of sending analog or digital audio signal to it.  While I've not tried digital signal but the analog works for me just like you stated in your question.  I've read in the product reviews that the unit can only output one type of signal at a time.  Meaning you can't have both analog and digital outputs at the same time.  Search the reviews may help.