Classic low-pass gates are probably best associated with the Buchla modulars. However, Rabid Elephant decided against the vactrols, aiming to produce something faster, more accurate, durable and natural-sounding.
Rainmaker consists of a stereo 16-tap spectral delay paired with a 64-tap comb resonator, the latter sporting external triggering options that turn it into a (single-voice) Karplus-Strong synthesizer.
RZ062 is a faithful recreation of a valve EQ that was made by Siemens in the 1950s — or rather, of two different valve EQs, because Audified have modelled both ‘A’ and ‘B’ versions of this processor as separate plug-ins.