I guess nothing then?

It's been over a year since this has been announced.  Does anyone other than Cakewalk and Overloud support this?

As of yet nobody else. Thanks for the reminder however, I've been meaning to post the interfaces and source code. 
I'll post an article on it soon. 
 

I know you guys have been really busy etc. and I could see how you could be distracted enough that this could get lost.
 
However, I also know that implementing VPC was probably not a trivial effort.  And that by not publishing the spec, it's like you never did it.  It's like you stayed up late to finish a paper and forgot to turn it in the next day.