Sound Output - Multi-Output Device Disappeared

I found a fix. I don't know why I missed this. I tried adding a multi-output device by clicking the settings gear in the MIDI Audio Devices app. This app comes with macOS, among the system utilities.

All it took was clicking the + sign instead of the gear. doi.

It's all over but the shouting at this point. Click a few checkboxes...

And the new multi-output device takes the place formally held by the deado device-o. Is it possible to find the remains of the dead multi-output device and find what killed it?

After rebooting about 10 minutes ago, no change in the situation, the multi-port device is still not present as an option for system sound output. Here is a screenshot of what it looks like.

After that, I shutdown and then started the system again. It looks like this in safe mode:

Restarting normally... what I mean is I shut down the system, then removed the power cable from the computer. After that, I held down the power button for about 10 seconds. 5 seconds into that, the was a soft click which clears the pram. Replaced the power cord and then powered on. The sound devices are back, except the multi-output device.