This MacOS app was mentioned in a thread from several years ago, but I felt like it was time for a repost.
viewtopic.php?f=12&t=7504745&hilit=audioswift
I recently tried the latest version with Reason Suite 11, and it works quite well as a controller. I requires a bit of setup, and there is a learning curve, but it does work in Reason, and it is currently on sale for 50% off with this coupon: BLACKFRIDAY50
There is a 15 day demo available.