Lexicon PCM96 - Manual (Page 54)

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Reverb Spin (Spin)
This is usually simply called spin. It controls the speed of the reverb random-
izer. Spin is also connected with the Reverb Wander parameter
Reverb Time Hi Cut
This parameter, also known as Hicut or RTHC is a low-pass filter in the
recirculating part of the reverb. It represents a frequency above which the tail
dies away more quickly. In some ways, it represents the opposite end of the
scale from BassRT, and may be considered an analog of air absorption. It is
also closely tied to the Hi Cut Damping parameter.
Reverb wander
This parameter (also known as just Wander), along with Reverb Spin, is used
to control the reverb randomizer. It controls the maximum size of random-
izer steps, and is expressed in a time value (typically milliseconds).
Room Size
Room Size corresponds roughly to the length of the longest wall of a rect-
angular room. In a more general sense, it corresponds to the overall dimen-
sion of some mythical space. This space has a geometry that causes sound
to bounce around. When the room size is small, the “walls” of this space are
closer together and the resultant reflection density increases. When the room
size is large, that density decreases. The most natural reverbs use room sizes
that vary from about 24 meters to 45 meters or so, but there are many useful
reverbs that are outside of this range.
There is a relationship between this parameter and the MidRT parameter.
Please see the MidRT parameter for clarification.
RtHC Damping
The damping parameter is closely tied to the RTHC parameter. It controls
the strength of the hi frequency absorption and has three values: Light,
Normal, and Heavy. The normal value gives filter response identical to previ-
ous Lexicon
® reverbs. The other values should be self-descriptive.
Scale
This parameter is used to modify the overall time of the selected early
impulse. It is a multiplier that goes from 0.5x to 2.0x. The actual time of the
responses varies from response to response. The Early Scale parameter simply
scales that amount of time. It’s fair to describe this a “rubber-banding” the
impulse response.
Selected LFO
This parameter determines which of the available LFOs may be used to con-
trol a voice. The voice may use the LFO output or the inverted LFO output.
Shape (Early Shape)
The Shape parameter is closely tied to the Spread parameter. Shape controls
how energy is injected into the reverberator. A low value means that sound
enters the reverb at the beginning of the spread window. A high value means
that most sound moves into the reverb at the end of the spread window. A
value somewhere in the middle means that sound enters the reverb evenly
across the spread window.