Reverb-O-Matic is a reverb plug-in based on Moorer's reverb model (from 'About this reverberation business').
It uses 6 comb filters in parallel followed by a single all-pass filter. The initial parameter settings are those recommended by Moorer for a sampling rate of approx. 44.1Khz. Each comb filter has a single-pole low-pass filter in its feedback loop to approximate the absorption of materials (i.e. walls) and these are labeled LP coefficients on the custom GUI.