You can’t do that in Totalmix but you can all of it in Logic.

On the master output after then atmos plugin insert a 7.1.4 Sample delay plugin and this will give you time delay per speaker. Then after that insert a 7.1.4 Linear Phase EQ plugin and this will give you bass management via it’s LPF/ HPF. Once you’re all set up don’t forget to save the preset in each plugin so you set it on any session you want.

Thats right it’s the speed of sound which yes is about 1ms of time per foot of distance travelled. You need a tape measure to get close to accurate and it’s easier to measure along the ground than through the air so mark an X on the ground under where your head will be then get to work with your tape measure to know the different distances for each speaker.

I have a 7.1.2 speaker system currently and this system works pretty good for me. Alos the multichannel gain plugin on the master is helpful for proof of concept because it has phase flip buttons. Using pink noise in the test oscillator plugin if you flip L & R one side out of phase you should hear a really good out of phase response if your delays are correct. Same is true for the other LR pairs - surround, rear surround, height front and height rear.

Yes the Trinnov seems very expensive for sure and now that Apple Monterey 12.4 can decode atmos streams without the need for external hardware that makes one more piece of the puzzle solved. I can listen to atmos Apple Music, Netflix, Stan, TV+ etc without any external decoder.

In my room all of the 7.1.2 speakers are all set to the same distance of 1.9 metres so no delays necessary. This means technically that the height speakers are maybe a bit too wide of the square due to my lower ceiling but at least I don't need to deal with speaker delays.

One more thing. When getting Logic to talk to the RME driver directly I found the speaker output assignment was unpredictable. For example if in Logic I sent a height speaker to output 9 that appeared as playback channel 33 in Totalmix (I have a Madiface with 64 IO). When I wanted to explore listening to Apple Music and streaming movies in Atmos it didn't work initially. Research uncovered that unless your audio IO presents to Apple Music and streaming web apps as 16 IO Atmos did not work. For me that meant adding Rogue Amoeba Loopback virtual interface set as 16 x 16 and assign that as audio device in preferences and then got loopback to send to RME.

For Atmos mixing in Logic I also do the same send Logic to Loopback and Loopback to RME. This made Logic speaker outputs numbering more predictable.

If you’re doing like in the video I can tell you exactly why Atmos is not working straight our of Apple Music and streaming web apps.

First is you need to be on Monterey 12.4.
In Apple Music the Atmos setting needs to be on Automatic.
In AudioMidi setup I see he has 24 outputs selected in the speakers window. This won’t work with streaming apps but it will allow Logic to deliver 7.1.4 Atmos

To get streaming apps to output Atmos as I said in my previous post Apple Music etc needs to only see 16 outputs in the driver so sending straight to RME won’t work because Digiface at 48Khz presents 32 outputs for example.
Get Rogue Amoeba Loopback virtual audio driver software.
Configure as 16 x 16 virtual device.
Configure loopback output to send to RME
In System preferences select Loopback as audio output device
Play Apple Music etc and you will see 12 channels in Totalmix playback channels.

No external Atmos decoding hardware required.

Done

Do you mean a bug that Apple's apps require a 16 x 16 driver to send to? That aspect may become more robust over time I suspect.

A little birdie inside Apple told a friend who told me that the Mac decoding atmos is no bug. Apple are investing big in Atmos and so it was a missing link not being able to play and listen to streaming content on Mac without tons of expensive hardware.

It's been a huge gap in the uptake of atmos in general before Apple enabled Mac based Atmos decoding. Before this a music maker could go to the expense of buying all the speakers to mix on before realising they have no way of playing back other professional content for learning.

Binaural is one thing but actual multi speaker atmos sounds so much better.

It appears Apple have licensed the Dolby Labs renderer as you see it as an option in Logic's atmos plugin so the licensing is already done it appears.

I had a look at your Marantz Receiver. Nice looking box but how do you get from the Marantz outputs to your speakers if they're connected to your Ferrofish Pulse?