thanks Karbo.... right I understand the basic drift but then if I have my normal audio device [ASIO pro device] I don't really see in reaper or other program the VAC IO's...
That said, I did get this working [with help from Son
]
https://obsproject.com/
and it solves a problem ... recording directly into Reaper from anything playing on a browser.... youtube, whatever.....
I did have a way to do that before, but this is much slicker...
...couple tricks to make it work but it is nice...