Lexicon PCM 91 - REV - Echo Parameters

Lexicon
3-26
PCM 91 User Guide
Link
This control is available in all algorithms except Ambience. When Link is set to
On, the reverb time (Mid Rt) and Spread scale linearly as the Size control is
varied. For some special effects, Mid Rt, Spread and Size can be unlinked.
High Cut
High Cut sets the high frequency cutoff of a low-pass filter. This parameter
affects both channels.
Range and Rate
Range and Rate controls in the Room algorithm in Chamber/Room can be used
to reduce coloration for small room sizes or to reduce the sense of periodicity
when the Infinite control is on. These controls allow you to set the range of a
moving delay and the speed at which it moves. High settings of either control
may be unsuitable for sustained tones, like piano.
Wander
Wander sets the distance (in time) that early reflections will move. For best
results with larger sizes, this control should be set to about 10ms.
Mstr Dly, Dly L, Dly R
In Rich Plate and Chamber/Room, Dly L and Dly R provide echoes to the left and
right channels. Unlike Delay and Reflect, which are isolated left and right delays,
left and right echoes are blended in the diffusor. The echoes are routed both to
the outputs and through a feedback path. Mstr Dly provides a simple grouped
control that modifies the left and right values from 0-200%.
Mstr Fbk, Fbk L, Fbk R
Fbk L and Fbk R modify the levels of the echo feedback path. The range is from
-100% to 0 to +100%. Mstr Fbk has a range of 0-100%. With low or moderate
settings, small changes of Mstr Fbk may not have an effect.
Row 5 of the Concert Hall algorithm contains expansion controls for a built-in
compressor/expander. (See also Compress at the beginning of this section.)
Ratio
Ratio controls the slope of the expander circuit.
Threshold
Threshold sets the threshold below which gain is reduced.
Gain
Gain sets the amount of negative gain.
Design cont'd.
Echo
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