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COMPOSER PRO MDX2200
inaudible as soon as considerably louder sound signals in the same frequency band are added. Nevertheless,
the further the level that the desired signal decreases, the more the noise floor becomes a disturbing factor.
Expanders or noise-gates offer a solution for this problem: these devices attenuate signals when their ampli-
tudes drop, thereby fading out the background noise. Relying on this method, gain controlling amplifiers, like
expanders, can extend the dynamic range of a signal and are therefore the opposite of a compressor.
In practice, it is shown that an expansion over the entire dynamic range is not desired. With an expansion ratio
of 5:1 and a processed dynamic range of 30 dB, an output dynamic range of 150 dB will be the result,
exceeding all subsequent signal processors, as well as human hearing. Therefore, the amplitude control is
restricted to signals whose levels are below a certain threshold. Signals above this threshold pass through the
unit unchanged. Due to the continuous attenuation of the signals below this threshold, this kind of expansion
is termed downward expansion.
The noise-gate is the simplest form of an expander: in contrast to the expander, which continuously attenuates
a signal below the threshold, the noise-gate cuts off the signal abruptly. In most applications this method is not
very useful, since the on/off transition is too drastic. The onset of a simple gate function appears very obvious
and unnatural. To achieve inaudible processing of the program material, it is necessary to be able to control the
signals envelope parameters. This is part of the many features of the COMPOSER PRO.
4. APPLICATIONS
In this section, several typical applications of the BEHRINGER COMPOSER PRO are discussed. The follow-
ing basic settings can resolve most dynamic problems. They are the ideal starting point. Please take the time
to study the application examples carefully, in order to be able to make full use of the COMPOSER PROs
capabilities in the future.
Main Applications And Initial Settings
The main applications of the COMPOSER PRO can be divided into three categories:
1. The EXPANDER/GATE section is used to eliminate interference and to suppress background noise and
leakage on individual tracks in multitrack recording.
2. The COMPRESSOR section is used to compress the program material and to create special effects and
unusual sounds, which are used for recording and musical performance.
3. The subsequent PEAK LIMITER section is designed to protect loudspeakers, tape recorders, transmitters
etc. from being overloaded.
4.1 Compression/levelling/limiting/clipping
Now that the functions of the individual sections have been clearly explained, we would like to acquaint you
with more terms and relationships of the dynamics process.
Compression
A compressor converts a large dynamic level into a restricted range. The extent of the resulting dynamic level
is dependent on the threshold, attack, release and ratio settings. As it is the desired effect of a compressor to
increase a low level signal, generally the threshold is set low. The inaudible compression mode requires fast
attack and release times and low ratios. The faster the chosen control times and the higher the compression
ratio, the greater the effect on the short term dynamics. This fact is often used to achieve audible and creative
sound effects.
Levelling
The levelling mode is used to keep output level constant, i.e. to compensate for long term gain changes,
without affecting the short term dynamics. Normally, the threshold is set quite low in order to be able to
increase low level signals. Levelling requires slow attack and release times, combined with a high ratio. Be-
cause of the very slow response time, levelling has no effect on signal peaks or short term changes in average
level.
Limiting
The limiting function requires a fast attack time and a high ratio and release time setting, which is dependent
on the specific use and the desired sound effect. As it is usually the task of a limiter to limit only high signal
peaks, the threshold is usually set at a high level. The dynamics are reduced dependent on the ratio setting
and the degree by which the threshold point was exceeded. If the attack time is adjusted to control only the
4. APPLICATIONS