here's the combi link:
and the DR-1 link, for the 3 Reason users who don't already have it:
https://www.reasonstudios.com/shop/rack ... ep-reverb/
the polarity inversion thing is something I think I'm going to keep exploring in my own sound design--there's some cool unexpected stuff to be found there, and having a reverb with a slow 'attack' seems like an interesting example.