Seems Windows 10 likes to 'force' Skype' into Windows Startup, upon updates (if "Signed in")
Problem is... it can wreak havoc with some audio card drivers (like Lynx).
I did two things to disable that:
1. Assign Skype to use input channels that I don't use, and to use Output Devices that i don't use.
2. Sign OUT of Skype (but importantly) Sign out with Option to NOT remember Sign On name/password.

Computer audio (computer card device) works perfectly again just after doing the above.

A quick search online reveals disturbing changes that Microsoft does to your setup with various updates. Keeping various restore points to roll a system back to after an update are probably just as important as keeping a good backup of data.