Thanks Hans. What I tried was taking the Normal Out of ST on a VAC and using it as the Input to SCA 1 and that worked perfectly.
When I select "Input 2 Separate Thread" the SCA doesn't work. Is that a bug or a feature I am missing
I still have trouble understanding all the Buffer settings and which ones affect which other ones but I just fiddle with them as while I am testing the latency doesn't bother me.
Thanks, as always, for the work you put into developing and supporting this excellent software.
Clipper