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This:
https://www.modulargrid.net/e/purrtronics-purrvrrb
It's the spring reverb that has no spring. The Purrvrrb is a digital emulation of a mono-in, stereo-out spring, but without the actual spring itself it's not subject to the issues that can happen (ie: feedback, noises from movement or impact, etc) to a true spring reverb. At $130, the price is great, plus the architecture of the module allows you to also use it to "stereoize" a mono signal. Also, this has a regeneration control, which allows the module to feed back on itself...which can be quite interesting depending on what you're feeding into it as well.