Creative 0404 PCIe Manuel du propriétaire télécharger pdf (Page 68)

5 - Effects

Core Effects Descriptions

68 Creative Professional

Parameters

Threshold

When the input signal rises above the level set by the Threshold parameter, the Gate is

triggered to turn on and go from its maximum gain reduction level up to 0dB gain. The turn-

on threshold is adjustable anywhere between -70dB and 0dB (below the PatchMix nominal

operating point of -12dBFS.)

One of the keys to the smooth operation of the Gate is that the input Threshold level that turns

on the Gate is always higher than the level that shuts off the gate. This means that the input

signal level must descend substantially below the Threshold in order to turn off again.

This difference between turn-on and shut-off levels, or the hysteresis, is 10dB. That means that

if the Threshold is -30dB, the signal level must fall to -40dB before the Gate will begin to shut

off.

Release Time

This parameter controls the time, in milliseconds, that is required for the Gate to shut off. More

speciﬁcally, this is the time that will be required for the Gate control signal to go from unity

gain at 0dB down to the Max Gain Reduction level.

The optimum value for the Release time is dependent on the program material as well as the

effect you're trying to achieve. Optimum Release time is also highly dependent upon the

settings of the Threshold and Max Gain Reduction parameters.

In general, times less than about 10 msec are prone to cause clicks in the output, while times

longer than 30 msec may make the gating effect obvious if the background signal being gated

out is very noisy.

Max Gain Reduction

This parameter sets the attenuation that will be applied to the signal when the Gate is shut off.

The Gate control signal will swing between 0dB and this value as the Gate turns on and shuts

off.

To perform a strict “gating” operation, Max Gain Reduction would normally be set to -inﬁnity

in order to completely silence the output of the Gate.

However, there are good reasons to set Max Gain Reduction to something less drastic than

inﬁnite attenuation. Sometimes the silence between gated signals is “too quiet” - especially

when the signal represents a solo vocal or instrument, where the complete lack of any sound

between voiced segments sounds unnatural. For these applications, setting Max Gain

Reduction somewhere between -20dB and -40dB is more appropriate.

In tandem with a high Threshold, Max Gain Reduction can also be set to very modest values

like -5 or -10dB in order to add a subtle “punch” enhancement to transients. This has an effect

similar to an expander, where the attack transients which exceed the Threshold stand out by 5

or 10dB above the normal signal (you can make up for that 5 or 10dB attenuation by using a

trim pot or boosting the channel strip gain after the Gate.)

Lookahead

By default, the Gate effect uses a ﬁxed 1 millisecond lookahead to avoid clipping off the leading

edge of signal transients when the Gate turns on. However, this is actually implemented by

adding a 1 millisecond delay to the signal through the gate. For applications where this

additional 1 millisecond latency is a problem, the Lookahead can be turned Off.

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Creative 0404 PCIe Manuel du propriétaire Page 68

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