What it does
Reverb built from scratch according to classic design of Moorer including early reflections (ref: "About This Reverberation Business", James A. Moorer, Computer Music Journal, Volume 3, Number 2, 1979).
The essence of the algorithm is the combination of six comb filters (combined into a single block for convenience) and an allpass filter which together produce the dense reverberations. The 7 or 19 tap FIR filter (Moorer Multi-tap block) is used to produce the early reflections. The delay is required to ensure that the dense reverberations from the allpass filter are synchronised with the output of the FIR block. A mixer is used to adjust the ratio between the early reflections and the dense reverberations. The final mixer is used to control the overall wet/dry ratio for the reverb.