Originally invented to add some "space" to the sound of Hammond Organs way back in the 30s, the reverb is a relatively simple design of a suspended spring inside a tank. The sound of the instrument is passed through the spring, and picked up again, blended into the original sound, and that's it.
For the core unit, Arturia based their software reverb on the legendary Grampian 636 spring reverb. The original 636 was the go-to reverb of The Who's Pete Townshend, of legendary dub producer Lee Scratch Perry, and a cornerstone of reggae and ska music.
The great thing about spring reverbs, and one of the reasons they have been so popular for the last 90 years, is that every one of them seems to have a unique tonal character. Some are bright, some zap, some zing, and poing, and some boing, but they all have their uses. This is one of the reasons Arturia included many different "spring tank" models in Rev SPRING-636: you can find the one that suits your music best.
Thanks to the power of our TAE and Phi modelling technologies, Arturia has been able to recreate everything that made the 636, and spring reverbs in general, so very special. True Analog Emulation handles the electronic side, analyzing and accurately modelling the way the circuitry works, and how it responds to various audio signals. Phi lets you study the physical nature of the reverb, how the spring reacts, how the tank's resonance changes the sound.