Lexicon MPX 550 - Manual (Page 89)

Parameter Descriptions
Lexicon
5-8
Mix (Dry, 1 to 99%, Wet)
Mix controls the ratio of unprocessed (Dry) and
processed (Wet) signal in the output. When the MPX 550
is patched into a console, this parameter should almost
always be set to Wet.
MstrRate (0 to 100%)
In Rotary programs, serves as a master rate control
affecting both the horn and drum rates.
Pch Fbk (L), (R) (-100% to +100%)
Controls the amount of feedback through the Pitch pre-
sets, resulting in repeated echoes with pitch progressing
up or down.
Pch (L), (R/S) (-2400 to 2600)
Control the amount of pitch-shift applied to the left and
right channels. For true stereo programs, the Pch(L)
parameter is not available and the Pch(R/S) parameter
means stereo. For mono programs, the Pch(L) and (R/S)
parameters mean left and right respectively.
Pitch-shifting requires some time shifting. A true stereo
(not merely Dual Mono) signal contains components
that are common to the left and right signals. A proper
stereo image is maintained only if the phase relationship
between the left and right signals is maintained. This
requires that the exact same computation be applied to
both channels, which is why only one control is provid-
ed for Pitch presets.
PDly (L), (R) (0 to 100ms)
Controls the amount of "look-ahead" required by the
pitch-shift algorithm. Some amount of pre-delay is
always in effect, even when this parameter is set to 0.
Phase (0 to 270deg)
Determines the relative timing between the left and right
channels.
PreDelay (0ms to 1.198sec)
Controls the time delay between the input of signal and
the onset of reverberation.