blayzell
Usually it seems that discontinued plug-ins carry forward to new versions of Sonar but obviously not R-Mix.

As mentioned in msgs #3,4 and 5, R-Mix SONAR should work in Platinum. I have seen others report problems using R-Mix (usually stability issues) but this is the first report of a license problem.
 
The first part of msg #7 was a reply to msg #6.

I have it working fine in Sonar Platinum 2017/02 on Win 10 x64.

scook
No, R-Mix SONAR was only available in X2 Producer. It is based on R-Mix, free standing audio editing program (not a plug-in) sold by Roland https://www.roland.com/us/products/r-mix/.
 
MashTactic looks similar to R-Mix SONAR. I have no experience with MashTactic.

Thanks scook. I tried to buy the full version of R-mix quite a while back, but every link I could find led to a product discontinued page, so I gave up. I was just hoping that seeing as it has been abandoned even by Roland and seemingly not replaced with anything else, that someone might know of some freeware version lurking somewhere in cyberspace.
 
I'll check your other recommendation though.