University of York Music Technology Group

York University Music Technology Group

VST Ambisonic Tools

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For use in multi-channel capable VST hosts such as Nuendo 1.5 (and above), AudioMulch, Bidule etc..


B-Plane Mirror screen shot


B-Plane Mirror is a 64-bit double precision ambisonics processor optimised for sound quality . In Nuendo, it should be used in the master effects section, positioned prior to the decoder, if this is in use.


Make sure your B-format signal is in W, X, Y, Z (1,2,3,4) format. Currently (as of July 2002) Nuendo and most other VST hosts do not offer a multichannel file input option so any B Format recordings have to be provided as two stereo files feeding separate input channels. Configure Nuendo so that these two channels feed the processor on these busses. BPan connects itself correctly automatically.


B-Plane Mirror allows you to distort a B-Format soundfield. It has three controls, a pair of direction controls, Azimuth and Elevation, which allow you to define the axis along which the mirroring takes place (Azimuth in degrees anticlockwise from due front, elevation in degree from horizontal ( 90 degrees is straight up)) and a mirror control. This varies from collapsing the field onto the plane perpendicular to the axis when it is at the centre point, to normal field presentation when fully towards the 'Normal' end point at +1 and mirrored fully towards the opposite direction at -1.0, the 'Mirror' end point.

In the early days of Ambisonics there was a analog mirror control which allowed the user to move the B-format soundfield from normal reproduction, through a point of no directional information at all then out through the other side to the point where all sound sources where in the diamterically opposed positions to their original locations. This was never very popular amongst users, because of the diffuse, non-directional location qualities in between the two extremes. B-Plane Mirror does things differently. The user defines an axis and the mirroring takes place either side of a plane at right angles to this axis. Sources on the plane always keep their locations, but sources either side of the plane move from their positions , through the centre point of the plane and re-emerge to take up position directly (rather than diametrically) opposite to their original positions. As a result, there is always a directional image (of the sources on the plane) to which the listener can 'anchor' their perseptions.


PC Windows

Simply drop the abfmirroredit.dll file into any plugin folder currently active in Nuendo or other VST software that you use, but I am now recommending that you put all the Ambisonics plugins in a new folder called 'ambisonic' inside your main VST plugins folder.

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Last updated on Thursday February 27th, 2003