3-3
The Algorithms and Their Parameters
Random Hall incorporates random delay elements which have several effects.
First, there is a reduction of long-lived modes in the reverberant decay, which
makes the decay less metallic and reduces the apparent reverb time. The
random elements also improve the steady-state timbre of the program.
The speed at which the delay elements move is controlled by Spin. Values of
Spin which are higher than about 40% can cause audible pitch wobble in very
critical material (such as classical guitar or piano) and can also cause noise on
pure tones. This noise is not audible in speech, however, and, for mixed music
or speech, values up to 50% will give an improved sound. Wander is typically set
to about 10ms at larger settings of Size. Smaller values of Wander should be
used when smaller Sizes are used.
This algorithm also offers the option of adding early reflections which have been
made into diffused clusters of pre-echoes. The density of the cluster is set by the
Diffusion control. We recommend that these pre-echoes be used with caution,
unless you are trying to match the sound of the reverberation to a particular
location where such reflections are strong.
An output width control affects the stereo image of the signal leaving the reverb
effect. OutWidth can add width to a signal, or move a reverb into a surround
channel. Either control can be used statically or dynamically, but in certain
positions may be mono-incompatible.
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