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It will prove useful to use the Behringer AUTOCOM PRO as the last component in the chain of effects units and
use the noise reduction function of the Expander/Gate section. We recommend that you use a slow release
time in order to maintain the natural reverb.
5.2.6 Creative Use Of The Expander/Gate Section
In addition to the previously explained applications, the Expander/Gate can be used to change the sound
characteristics. For example, the quality of ambience or reverberation created by an instrument within a room
can be modified: when an instrument stops decaying, the reverberation of the instrument falls below the user-
defined threshold. The reverberation can be controlled by using the THRESHOLD control and the RELEASE
switch. The decay characteristics of the instrument can be controlled using the release switch, so that the
natural characteristics of the instrument remains. Experiment with the effect, this control has on the decay of
the instrument. In SLOW mode, the signal is gently faded out - in FAST mode, the duration of the reverberation
can be removed completely.
5.3 Compressor Section
The task of a compressor is to reduce the dynamic range of program material and to control the overall level.
The extensive controls of the Compressor section, provide a great range of dynamic effects: from musical and
soft compression to limiting signal peaks, right up to extreme and effective compression of the overall dynam-
ics. For example, a low ratio and very low threshold setting can be used to achieve soft and musical processing
of the general dynamics of the program material.
Higher ratios, together with low threshold settings, create relatively constant volume (levelling) for instruments
and vocals. High threshold levels generally limit the overall level of a program. Ratios greater than 6:1 effectively
prevent the output level from significantly exceeding the threshold point (provided that the OUTPUT control is in
the 0 dB position).
Please note that the compression of the entire program material (achieved by low threshold settings) sounds
less natural with higher ratio settings. Ratio settings in the range of 4:1 and lower, effect the dynamics of the
program material less and are often used to compress the sound of a bass guitar, a snare drum or a vocal.
Sensitive and moderate settings are generally used in mixing and for levelling of program material in broadcast.
Threshold
Gain 0 dB
Input
Output
oo:1
Limiter
Ratio 2:1
Ratio 4:1
Hard Knee
IKA Curve
Fig. 5.2: IKA characteristic of the compressor section
The new IKA (Interactive Knee Adaptation) circuit prevents aggressive compression, created by high ratios,
from sounding too unnatural. This is achieved with an interactive control function, which begins above the
threshold level and introduces a Soft Knee curve characteristic in the range up to 10 dB above the threshold
point. Beyond this range, the signal is subjected to linear (Hard Knee) compression.
+ With the threshold control completely turned to the right, the threshold value is +20 dB. Since such a
value will not be reached in practice, you can use it to disable the compressor section and work exclu-
sively with the expander/gate and dynamic enhancer circuits.
5.APPLICATIONS