Lexicon PCM96 Reverb Spin Spin, Reverb Time Hi Cut, Reverb Wander, Room Size, RtHC Damping, Scale

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.

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