Subdecay has captured every nuance of tube driven spring reverb by analyzing design, sound and the physics of real spring reverb tanks. Even something as innocuous as unplugging your guitar cable (kerplangagnangang) sounds like real authentic springs. While much gear was evaluated the main inspiration for the spring setting is still our 68 Twin Reverb. Unlike the amp you can bend nature of physics with the decay control (something even an outboard tank can’t do.) A tone control was added allowing you to dial in the perfect timbre. There is also an internal trimmer for running hotter signals in to the reverb. The trimmer serves two purposes- 1. It allows you to turn down for hotter signals. 2. It does essentially what the dwell control does on an outboard reverb tank. You can turn it up for a more dramatic effect or back it off for subtlety.
Subdecay has retained an all analog signal path for your clean signal with an improved preamp. JFET amplifiers carryout the send and recovery of the reverb signal for even more tube like dynamics. The Super Spring Theory is even better in front of overdrive pedals or a dirty amp.