Chris, good research but misleading... let's clarify this...
As I stated:
Like Gary said, No; the S/PDIF cannot be used to Sync the device to anything, it can transfer digital audio (stereo only) to and from other devices, since the S/PDIF signal combines both the clock and audio info in the same signal, no other cables (like Word Clock) are needed; important to note that this has to be done in real time and...
What you stated:
Not True from what ive researched.
"The SPDIF stream carries data AND clock timing" https://www.diyaudio.com/community/threads/spdif-code.383279/
which is why its neccessary to link two PCI audio multi-cards using a SPDIF cable to get them to sync up and act as one interface in ableton live on os9
To clarify, SPDIF via Toslink or RCA connector will send/receive a stream of digital audio with clock info meaning your audio can be transferred (and sound great) without the need to use "Wordclock" that is needed typically to get 2 audio devices locked in "sync"; but we are using the term "sync" loosely.
As Gary correctly stated, S/PDIF CANNOT be used as a sync method to a DAW meaning that you CANNOT control the transport at all, no Start, Stop, arm record, play... yada, yada yada. So basically all that great MMC / MTC MIDI stuff that locks the 2 devices is NOT possible via the S/PDIF... As noted on your video, "Roland VS880ex as Control Surface/Audio i/o for Logic 8 (or any DAW with
midi/mmc)" Now That's what we are talking about when we mean "syncing to your DAW"
In fact, unless you hate the D/A converters or A/D of one device, then the S/PDIF is really not all that useful S/PDIF is a nice way to transfer digital audio without re-converting. Again, this has to be done in real time, there is no "S/PDIF Dump" mode that will transfer the whole track or file, so you might as well just hit "play" on the roland (since it has nice D/A) and then hit "record" in your DAW and use the A/D of your interface, this way you can adjust volume and EQ (you can't adjust anything via S/PDIF)
Lastly, where S/PDIF really shines with macs.. there are many Intel macs with S/PDIF and they have a secret bonus, many old Mac pros, macbooks, and Intel imacs have SPDIF built in. It is a little known fact that the 1/8" analog audio output on many imacs also spits out optical S/PDIF out of the same jack !
https://support.apple.com/guide/mac-help/about-audio-ports-cpmh0052/macSo, the secret bonus is that you can use pre-amps with digital out or even whole audio interfaces (like Mindprint TRIO S/PDIF) and not even have to load drivers ! So these devices can work NO MATTER what OS or DAW and no software for the device is needed, just set the mac system preferences to "optical"
Here is the cable needed for macbook/imac:
https://www.amazon.com/KabelDirekt-TOSLINK-Optical-Digital-Audio/dp/B00GZQWM54For Mac Pro:
https://www.amazon.com/Syncwire-Digital-Gold-Plated-Compatible-Playstation/dp/B07S5XKHC6