Available for download, u-he Twangström is a spring reverb with a lot of tricks up its sleeve. The verb is modeled on three different reverb tanks and offers a drive section, filter stage, envelope, and comprehensive modulation matrix. Achieve rock 'n' roll sounds commensurate with the glory days, or tweak spring verbs into futuristic ideas not yet conceived.
Rather than using impulse responses, the Twangström mimics the physics of real-world reverberation in the software domain, simulating the waveform traveling through the mechanical medium of a spring. This means all aspects of the plug-in are controllable in real-time. Conveniently the software can receive MIDI CC to act more like a sound-design tool than a reverb effect.
The verb offers four different envelope modes and three sources, picking up signal from the input, output, or external sidechain. The LFO makes use of eight waveforms, which can be synced to your DAW. For even more tweakability, use the modulation matrix to affect any parameter, including shaking the simulated reverb tank, which creates a shock of sound.