I'm using the heavy saturation module. when I follow up the instance of saturn with anything that drives the signal - ex. guitar amplifier, saturation, distortion, etc I get a huge tail of real actual reverb. I've confirmed that saturn is the plugin responsible for the reverb. if you don't believe me you can test this yourself - just load up heavy saturation and drive it and then follow up with any guitar amplifier and you'll get reverb.