Downsampled internally to reproduce the artifacts of running at a lower sampling rate. Replicates the reduced bandwidth of the earliest digital reverberators (10 kHz maximum output frequency). As you switch through the eras, the colors of your GUI change, too. NOW is too digital, clean, and colorless. The 1980s is still funky, but with a brighter sound.
The 1970s color model is dark and noisy with the potential for strange and random artifacts. The COLOR control dials in the tone color and sonic artifacts of each specific reverb era. The MODE control in Valhalla VintageVerb is a super powerful, high-level control that allows you to switch between 18 different reverb algorithms.
Reverb Modes: Concert Hall / Bright Hall / Plate / Room / Chamber / Random Space / Chorus Space / Ambience / Sanctuary / Dirty Hall / Dirty Plate / Smooth Plate / Smooth Room / Smooth Random / Nonlin / Chaotic Hall / Chaotic Chamber / Chaotic Neutral / Cathedral (new in 2.2.0)