It sounds great. The rooms sound natural and spacious. The plates are extremely dense. The decays are silky smooth without annoying artifacts. The reverb is clearly audible without being muddy. When applied to stereo inputs, the stereo soundstage is maintained with proper balance.
It can reproduce a range of spaces. MasterVerb contains two different algorithms to generate the dense late reverberation: a hall algorithm and a plate algorithm. Each of these algorithms has independently adjustable size and decay time controls, so they can be morphed across a wide range of characteristics. The hall algorithm is intended for acoustic spaces, e.g. rooms, chambers, studios, halls, while the plate algorithms is for, well, plate reverbs. An early reflection section allows for various early reflection patterns, again with adjustable size. Wet and dry delays allow for pre-delay and other delay effects. Two three-band EQs are provided: the early EQ shapes the overall tonality of the reverb response and the late EQ shapes the frequency dependent decay. On top of that there is a triggered amplitude envelope which can generate gated and reverse reverb effects. So, there is a ton of flexibility here. MasterVerb ships with 60 presets which cover a wide range of reverbs and serve as starting points for further exploration.
The interface allows you to quickly visualize the changes you are making. A reverb time response lets you see the reverb decay, early reflections, amplitude envelope, and delay settings. A 3-D frequency response plot shows the reverb decay as a function of frequency. There are graphical frequency response controls for both EQs.
Considerable effort went into designing the low level algorithms so they could be fully automatable and also extremely CPU efficient. The result is that MasterVerb takes far less CPU than other reverb plug-ins.

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