Rapture 'Pro' is a mess, a total mess.
 
Massive CPU drainage compared to Rapture 1, far far worse than Diva, which multithreads here on El Capitan effortlessly while R 'Pro' maxes out my CPU with a monophonic sound.
 
Disaster!!!
 
Come on Cakewalk, sort this out.
 
A great synth, my favourite for ambient, ruined!!!
 
Don't buy this machine. you'll regret it!!!
 
MT

 
You can continue to use Rapture 1.22.  That's what I've chosen to do for the time being.  Partly because of problems reported such as yours, but also because of how disruptive intalling it would be to my system.
 
 

Paul P
 You can continue to use Rapture 1.22.

That might be difficult on a Mac

I am having multiple issues with Rapture Pro, as well, but have not yet created detailed steps to produce the problems.  I will be trying to gather up that info and present it in one or more threads, later on today or tonight.
 
In the meantime, I swapped out Rapture Pro for Dimension Pro, and it reads the same sounds and does not exhibit the same problematic behavior.
 
Bob Bone