CruncyLicensePlates

Linus, 
 
You like to review expensive things with sometimes dubious quality / specification claims, since you're building a big home theater in your studio / home / pool, this would make for an interesting video review. 
 
Hi-End Stereophile gear prices can be through the roof, it's referred to as "luxury audio" by JBL who has a whole division dedicated to building products for the same customer that would buy that HP Omen X monitor you just reviewed. We all know that ferrite magnets are put on some cables to reduce RF on audio and data cables. But as for the digital media going across a data cable having it's audio quality differ because of a ferrite magnet? 
 
A hi-end audio home theater cable company in the US has come out with a "special USB-C" cable that is "tuneable" (??) that's supposed to give you better audio by massaging the data (?). http://www.stealthaudiocables.com/products/usb-cables/usb/

This company has a product called: STEALTH USB –T
“T” stands for “tunable” – the sliding ferromagnetic collar allows to fine-tune the sound.
 
They claim
 
"Such a sliding collar proved to be quite efficient on our AC cords, loudspeaker cables and the Sextet V14-T, and it works as efficient for the USB cables.
The user moves this collar along the cable, while listening, and at a certain position the sound comes into focus – the same way as it is with a photo lens. This is a tedious procedure, and it usually requires several hours of careful listening, but the ending result is definitely worth the effort.
The Select version is made of all hand-picked selected parts and wires; the cables is hand-tuned using our proprietary measuring equipment, it is a labor intensive and lengthy procedure, this is why the price for the Select is higher."
 
PRICING
The suggested Retail for the standard STEALTH USB is $850 in 1 meter, and $200 for extra meter;
The suggested Retail for the USB-T (user-tunable) version is $1250 in 1 meter, and $200 for extra meter;
The suggested Retail for the USB-T SELECT (user-tunable SELECT VERSION) version is $1650 in 1 meter, and $350 for extra meter
 
 

Another idea I have for you is along the lines of the informative / educational. 
I really liked the LIGO facility - Gravitational Waves video and the IBM Model M video, you're probably scratching your head on more content to do like that.  Reminds of PBS programming here in the US, a lot of that content came from Canada as I remember. There was a program called NOVA that delved into the deeply scientific topics that you're getting into. 
 
You could expand on the LIGO video by doing a Part 2 and go to Fermilab near Chicago in Batavia, Illinois, they are connected to LIGO and CERN (Part 3?) in France, the tours are free and AWESOME! If you remember the lab in Tron? (the original), it's like that and cooler. - http://www.fnal.gov/
Here's an image from inside the facility deep underground, they have it all lit up with nice lighting for effect here. 
 

 
Another good video would be to talk about Moore's Law and where modern computing ends at the point where silicon melts and what the future has in store and how soon will it be here? Details could review Supercomputing / P-Type vs N-Type doping, etc, you could call it, what if we could run CPU's at 5GHz speeds at room temperature? 
 
Great work with what you're doing, keep up the great work. 
 

You are 100% correct. Integration of USB into Analog mixers is confusing for this 1 reason. It's a single channel on the mixer that is dual purpose. One for use stand alone / input to mixer and output from the computer. I neglected to mention that on Ch 9/10 there's a button to send the audio to the computer in either Mono or Stereo. 

I'd like to point out too, that that Level Stereo nob does NOT affect how out the USB signal is into the computer, and I know because I have done numerous tests on this and the 9/10 is only designed for mix out of ALL THE CHANNELS, and USB in for bringing your computer playback into the mixer and I really feel people are missing this point royally.

You need a 4 channel 2 output mixer. Otherwise the signals can feed back from one device to another. The mixers combine the analog signals safely. The ons @Mira Yurizaki would work great, however as he said there are cheaper options. For instance I was researching a few months back and the can be had for under $50.
Be warned though, the cheaper ones use lower quality everything so your output sound may be lower quality than a brand name one. 
Another possibility is to plug the echo into your pc line in /mic port and have the pc pass it to your speakers