Lexicon PCM NATIVE, Owner'S Manual

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Spin controls the rate of randomization. In most cases, values between 1 - 2 Hz
are appropriate. Wander controls the amount by which various delay values may
be modulated. Typically, these values should be smaller for plates and chambers
or for very small rooms. But it’s always best to listen with the material you’re us-
ing.
Tail Width
This parameter is present in all stereo reverbs and rooms. The reverb tail (all
components of the reverb except for early reflections, etc.) is passed through a
simple 2x2 matrix. This provides an encoding of the tail that dramatically changes
its spatial characteristics. The tail can be changed to feel narrower (even down to
mono) or wider than normal stereo. There are values for the parameter to encode
the tail in such a way that it decodes into surround channels.
The parameter operates in the range of 0 to 360 degrees, with an incremental
change of 1 degree. The matrix uses Sine/Cosine rules so that power distribution
remains constant. This may be acceptible—even highly desirable—but the mix
engineer must fully understand the process and its implications. It is possible to
compromise the mono compatibility of a mix by using this parameter carelessly.
This is a powerful tool for audio whose release format is two-channel. It is not
useful in any other format. Formats include compact disc and radio/television
broadcast. Some of these effects are clear and noticeable without any sort of
decoder. Many are even more dramatic when a decoder is in place, such as in a
home theater.
It is strongly recommended that you monitor in all possible formats (stereo,
mono, matrix surround) when using this parameter.