But, more importantly, it sounds excellent, comparing favourably with both hardware and software reverbs costing several times its price, from revered manufacturers. The level of control afforded by Roomverb M2 is staggering. Extensive facilities are provided for preset management, and skins are supported. Two edit buffers (A and B) are used in parallel for easy comparisons. Some sections or individual features that may not be required can be disabled individually to save CPU cycles. Separate pan, shift, crossover and stereo width pots are available for the early and late reflections, and an adjustable gate can be applied to the early or late reflections, or both.

The input, wet/dry mix, early reflections and late reflections levels can be set using faders, and monitored individually using mute and solo buttons. The Air and Material absorption curves are superimposed in the bottom graph. The materials can even be blended or stacked. The section in the middle of the window allows EQ'ing of the early and late reflections, with the EQ curves cleverly superimposed in the top graph, and frequency-dependent control over the absorption characteristics of the air and room materials (with a preset list of 35 materials including 'brickwork', 'solid wood panels', 'heavy drapes' and so on). The available parameters here are type (harmonic 1 to 5, random 1 to 5 and mixed 1 to 5), depth, rate, and stereo width. In the Late Reflections section, controls are provided for density, pre-delay, offset and shape, while the Modulation subsection offers control over left/right modulation. The Early Reflections section has controls for the number of reflections, pre-delay time and decay type (Natural, Exponential 1&2, Linear 1&2, or flat), and decay can be reversed. A slider provides control over diffusion, with a switch for mono or stereo mode (mono mode means that the diffusion setting does not affect the stereo image).

A hard or soft bounce can be selected independently for the walls, floor and ceiling. The placement of the sound source and listener, in relation to each other and to the walls and corners of the virtual room, can be defined, as can the sound source height, listener height, distance between source and listener, distance between left and right microphones, and wall absorption. The Virtual Room section offers control over the width, depth and height of the room by way of three linkable sliders. A glance at the interface immediately suggests that Roomverb M2 offers an exceptional degree of control over not only the usual reverb parameters, but also some unusual ones. It is available in both VST and DX formats, and I tested the VST version. Spin Audio's Roomverb M2 is purported to deliver top-quality reverberation for native PC platforms.

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