Thanks for that, in fact many computer MOBOs have a S/PDIF header on the PCB and just need the approriate plug and cable (any back street PC shop should be able to wreck one out of a failed board for a $) You will almost certainly need to get into the BIOS to turn it on but it could be handy?"
That port is part of the on-board sound. Most older ones don't have an optical out. Few people use this stuff, or even know what it is. It probably exists, deactivated, in your recording devices. Software should turn it on, just like all the rest and will, BY GOD, mute all other outputs, when it does. (Select default device)
First, we may have different interests in this conversation. My goal was to get the stupid computer to provide me with two outputs - digital, and analog. Should have been soooo simple.
But this stuff was designed in the 1080s and has, apparently, been ignored, since then

(You could still get Qualudes in the '80s, which may explain the windows "mixer") No one perceived the PC as an audio processor until long after it's inception. Today, it's a PC in name, only, and more than up for the task! Time we USED those eight cores....
Funny, how things work. This farcical issue stopped me, dead in my tracks, and augmented my humility, greatly

I was not a happy camper there, for a while. But I *AM* the PC God (my PC, anyhow)

and I *WILL* prevail. I always do. Sometimes it takes a while... In the meantime, something I was stone clod certain was extinct came back, from the dead. A need, in the PC software jungle.
Now I have become interested in the overall capabilities of PC sound "architecture." I just might try to improve the capabilities of a system not designed with with what we now do with these computers in mind. I found a program that creates the "patch cord," which will be the basis of my offering (if any), so I know it can be done.
"In the past I have used optical to co-ax converters, both ways around when I was messing with Mini disc (optical) and a 2496 card (RCA) I detected no loss of quality. Another handy device is the "Techole" S/PDIF to analogue converter.* As the name suggests, this takes a digital source and outputs L&R on RCA plus a fairly punchy headphone output. Easily powered from any handy USB port.
I have one on my JVC smart FSTV feeding a fairly decent hi fi rig.
*Input is optical and RCA.
Dave
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