Echo; Expand - Lexicon PCM 90 - REV 1 User Manual

PCM 90 User Guide Lexicon
Design cont'd.
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.

Echo

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.

Expand

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.
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