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MPX 200
consoles can also send Continuous Controller or
Program Change messages.
The MPX 200 will learn these messages and set tempo
via MIDI. The unit can also receive and utilize MIDI
Clock. See Section 5: MIDI Operation for instructions on
setting MIDI controllers.
THE COMPRESSOR
The MPX 200 compressor can be used either:
•
for subtle reduction of volume changes so that
quieter passages in program material can be made
louder.
•
as a limiter to prevent volume from exceeding a
certain level.
For subtle volume reduction of volume changes, use a
lower Ratio setting. Set Threshold low enough so that
program material is above threshold much of the time.
For severe limiting, a high Ratio setting (10:1) is
necessary, but Threshold should be kept high enough so
only the loudest peaks are compressed.
Attack controls how fast the compressor responds to
volume increases. The best setting for Attack depends on
the frequency content of program material. A fast Attack
setting allows less sound to "leak through" before the
compressor reacts to sudden volume increases. But if
Attack time is shorter than the period of the
predominant low frequency in the music, the
compressor will react to the music's waveform rather
than its volume envelope, resulting in various forms of
distortion. If this is heard with low-frequency material,
increase Attack.
Release time determines how fast the compressor
responds to volume reductions. With most music
material, Release time should be longer than Attack time.
This is especially true with instruments such as guitars or
pianos, which have their own natural slow volume decay
on sustained notes.
Compression can be overused. For most music material,
compression should be used in moderation so the
listener does not notice the results.
Basic Operation
2-7
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