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MULTIGATE PRO XR4400 User Manual

output

input

gain 0 dB

IRC curve

expander. 1:8

noise gate, 1:∞

threshold

Fig. 6.3: IRC characteristic curve

The result is an expansion process that is less difficult to adjust and more tolerant 

towards wanted signals whose levels are only slightly above the level of the 

background noise. 

5.2.6  RATIO function 
The ratio of the input-level-change vs. output-level-change after the onset of the 

control process, i.e. after the signal has dropped below the threshold, is called 

expansion ratio and can be set with the RATIO control. RATIO settings from 1:1.2 

through 1:4 give you smooth and exactly dosed downward expansion.
The RATIO scale printed on the front panel indicates the expansion ratio in 

decibels, i.e. it shows you the decibels by which the output signal is cut for each 

reduction by one dB of the input signal.
With a 1:1 ratio the output signal level is the same as the input signal level, 

i.e. there is no signal change. A ratio of 1:2 means that the output signal is 

reduced by 2 dB when the input signal drops below the threshold by 1 dB. 

Accordingly, with a ratio of 1:4, the output signal is cut in level by 4 dB when the 

input signal is 1 dB below the threshold.

The four channels of the MULTIGATE PRO can be operated both independently 

of each other and in couple mode. In particular, when you record a choir it will 

be useful to couple the individual microphone channels. For example, when all 

microphones are controlled by one singer, all vocals start and stop precisely 

at the same point of time. Also when synchronizing several instruments, 

inaccurate entries of individual musicians can be avoided.
To expand phase-coherent stereo signals (i.e. signals having the same phase), 

it is imperative that the control processes be triggered simultaneously in both 

channels. Due to the differences in perceived loudness between the left and right 

channels, unwanted shifts with reference to the stereo basis would be produced.
The innovative FlexLink function implemented in the MULTIGATE PRO allows for 

a variety of couple options. For example, when you press the COUPLE switch of 

channel 3, this channel is automatically configured as a “slave” channel, while its 

neighbor—channel 2—becomes the “master” now controlling both channels in 

all their parameters.
Activating the COUPLE switch automatically disables all controls and switches 

of channel 3 (except for the MONITOR switch). Now, the controls of channel 2 

take over full control of channel 3. Similar to a stereo fader, both channels work 

in sync. To control channels 2 and 3 from channel 1, simply press the COUPLE 

switches of channel 2 and 3.

Each channel has a parametric filter whose frequency and quality (bandwidth) 

can be set precisely. This tunable filter allows you to select and fade out 

specific frequencies that would otherwise lead to unwanted triggering of the 

expander circuit.

5.4.1  The MONITOR function
This switch links the sidechain control signal with the audio output, while muting 

the audio input signal, so that you can pre-monitor the filter output and tune the 

parametric filter.

This chapter describes a few typical applications of the BEHRINGER MULTIGATE 

PRO. Starting from the basic setting shown below you can find solutions to 

most dynamics-based problems. Please take your time to study the following 

application examples thoroughly, so as to be able to fully exploit the variety of 

features your MULTIGATE PRO offers.
Basically, the BEHRINGER MULTIGATE PRO can be used in three areas 

of application:
1.  Eliminating interference noise and suppressing crosstalk in multi-channel or 

multi-microphone configurations.

2.  Expanding the dynamic range of compressed program material, 

refreshing sampled sounds and creating special effects and sounds.

3.   Using the MULTIGATE PRO as a de-esser and to specifically eliminate 

interference noise from recordings as well as to reduce the risk of feedback 

in live situations.

Understandably, there is no standard setting that suits all kinds of applications. 

Rather, the controls and switches must be set specifically for the application 

on hand. However, by studying the following practice-oriented descriptions 

of typical applications you will soon develop a feel for how the various 

functions work:

6.1.1  The gate function
“Gating” is a so-called “high ratio” expander function and represents the 

simplest function of the BEHRINGER MULTIGATE PRO. When the expander is 

operated with maximum gain reduction (RANGE control fully to the left), it works 

in “hard gating” mode. The gate function is used to automatically mute single 

channels in multitrack mixdowns, stage microphones currently not in use and to 

suppress background noise and crosstalk in multi-track recordings. In particular, 

when processing percussive instrument the use of the “hard gating” function 

is recommended.
A few examples show you how to do it:
Electric signals from percussion instruments have a very short rise time. The time 

between single hits on the instruments is normally filled up with noise produced 

by adjacent instruments or room reverb, which makes it difficult or even 

impossible to separate microphones acoustically. This unwanted crosstalk effect 

can be accurately eliminated with the MULTIGATE PRO.