Here's what iZotope/Exponential Audio say:
NIMBUS by Exponential Audio offers precise control over natural stereo reverbs. With authentic reverb tone, filter mechanics, compression, overdrive, tempo-syncing, and warp effects, the advanced controls in NIMBUS allow you to sculpt the perfect reverb for your music.
- Natural stereo reverb algorithm
- Dynamic tail suppression to lower reverb in louder parts of a mix
- 5 additional early reflection patterns and additional plate reverb algorithm
- Over 1,200 presets
- Pre-delay and reverb delay adjustable by tempo