Spin And Wander; Tail Width - Lexicon PCM Native Owner's Manual

Spin and Wander

These two parameters control randomization effects within the reverb. Randomization is
used to control the spectral purity of the reverb. It can also, at some settings, create a more
noticeable modulation effect. Artificial reverbs sometimes create audible artifacts with some
types of signals. For example, a voiceover in a very small room might sound a little metallic.
Randomization works to minimize these effects and remove the sense of ringiness.
Spin controls the rate of randomization. In most cases, values between 1–2 Hz are appropriate.
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 using.
Wander controls the amount by which various delay values may be modulated, or the maximum
size of randomizer steps, and is expressed in a time value (typically milliseconds).

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 acceptable, 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.
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