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MPX 500
Release Notes
NEW SYSTEM MODE PARAMETER
R1-MPX 1 Mode has been added to the system parameter MIDI Program Change. This additional setting
enables the MPX 500 to respond to program change messages from a Lexicon MPX R1 Foot Controller
set to MPX 1 Mode.
Parameter Settings Default Setting
MIDI Program Change Enabled, Disabled, R1-MPX1 Mode Enabled
OVL INDICATOR SIGNALS DSP OVERLOAD
The OVL indicator located below the input meters reflects the internal processing state of the
MPX 500, not clipping of the inputs. Intermittent flashing or constant lighting of this
indicator signals the need to reduce input levels or the value of a parameter on the verge of
feedback. Input overload is indicated on the meters themselves. When input clipping occurs
on either channel, that channel’s meter changes to “inverse” video, signalling the need to
reduce input levels. The diagram pictured at left shows clipping of the left channel as well as
internal processing overload.
OVL
CHANGING SIZE AND DURATION PARAMETERS
Changing the Size parameter in Reverb and Ambience presets or the Duration parameter in Gate presets
will cause the program to reload. The program must reload in order for the unit to execute the extensive
audio re-routing associated with changing these parameters without producing unwanted noise. The
System Mode parameter Program Load Mode determines whether the MPX 500 will mute or bypass
during this reloading.
MEMORY PROTECT MODE
On page 19, the MPX 500 User Guide incorrectly states that Memory Protect Mode prevents changes to
the User Bank or the System Parameters. When enabled, Memory Protect Mode does prevent changes to
the User Bank. But it does not prevent changes to the System Parameters, nor does it prevent restoration
of MPX 500 factory-default settings. This means that Factory Init will erase any stored programs in the
User Bank.
A Harman International Company
Lexicon, Inc.
3 Oak Park
Bedford, MA 01730-1441
USA
Tel 781-280-0300
Fax 781-280-0490
www.lexicon.com
Customer Support
Tel 781-280-0300
Fax 781-280-0495 (Sales)
Fax 781-280-0499 (Service)
Lexicon Part No. 070-14117 | Rev 1 | 05/01
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MPX 500 Release Notes
Lexicon
ADJUST KNOB ASSIGNMENTS
The User Guide lists incorrect Adjust knob assignments for some programs. Below is a list of these
programs with their correct Adjust knob assignments:
49 HiCut
88 Inversion
103 Time (0-400ms) + Feedback
104 Time (200-1200ms) + Feedback
153 Mid-band Reverb Time
154 Mid-band Reverb Time
155 Mid-band Reverb Time
174 Mid-band Reverb Time
PARAMETERS PATCHED TO TEMPO
• The Edit knobs cannot be used to adjust parameters patched to Tempo. Some MPX 500 programs
link Tempo to certain parameters. In these programs, the message “Patched to Tempo” will appear
on the display when changes to a patched parameter are attempted.
• Both the User Guide and the previous version of these Release Notes provide lists of programs that do
not have Pre-delay patched to Tempo. Following is a complete and correct list of these programs: 3,
5, 6, 7, 63, 64, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 210, 215, 236, 237, 238.
• A Tempo patch was added to preset 12.
PROGRAM 114: STEREO STAGE
Program 114 is now Stereo Stage, designed to supply reverb while preserving stereo imaging in a live
stage setup. Stereo imaging is preserved via time delay rather than conventional L/R panning so that a
proper channel mix is maintained in both L and R speakers.
To use this program, observe the following:
• Use the MPX 200 in-line between mixer and house amps, not as an effect that is mixed back into
the main L and R signals.
• On your mixer, pan the input channel for each musician fully to that musician’s side of the stage.
• Keep Mix set to 50% (the default setting when Program Load is set to Program).
• Adjust your Reverb level by changing the Balance parameter between full left (-50) and about
-10. (Typical values should be between -45 and -40.)
• Set "Width" for the distance between the speakers at each side of the stage. The program loads
with an assumed width of approximately 20 ft. The available range via the Adjust knob is 10-50
ft. These values assume that most audience members are seated within 30 degrees to either side
of the stage centerline. If many audience members are seated further to the sides of the stage the
Adjust setting can be increased, but otherwise it should be kept as low as possible.
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