American Audio DIGI-PRO User's Guide download pdf (Page 54)

Eleven Rack User Guide48

Dyn III Compressor

This effect is based on the Compressor plug-in

from the Dynamics III plug-in set that comes

with Pro Tools. It lets you control the dynamics

of your guitar signal, much like Gray Comp.

However, while Gray Comp emulates a classic

guitar-specific compressor pedal with a smooth,

liquid tone, Dyn3 Comp is more versatile, act-

ing more like an outboard compressor used in

recording situations. This effect includes the fol-

lowing controls:

Threshold Sets the level that your signal must ex-

ceed to trigger compression or limiting. Signals

that go above this level will be compressed. Sig-

nals that are below it, will not.

Attack Sets the attack time, or the rate at which

gain is reduced after the input signal crosses the

threshold you’ve set. The smaller the value, the

faster the attack. The faster the attack, the more

rapidly the Compressor reduces the signal’s vol-

ume.

If you use fast attack times, you should generally

use a proportionally longer release time, partic-

ularly when the material contains many fast

peaks, (such as a staccato palm-muted guitar

part). Very fast attack times (especially below

1 ms) can produce undesirable distortion on

guitar.

Release Sets the length of time it takes for the

Compressor/Limiter to be fully deactivated after

the input signal drops below the threshold

you’ve set.

Release times should be set long enough that if

signal levels repeatedly rise above the threshold,

the gain reduction “recovers” smoothly. If the

release time is too short, the gain can rapidly

fluctuate as the compressor repeatedly tries to

recover from the gain reduction.

If the release time is too long, a loud section of

the audio material could cause an effect called

“pumping and breathing” in which quieter

parts of the signal are affected in ways that may

or may not be desirable.

Gain Lets you boost overall output gain to com-

pensate for heavily compressed or limited sig-

nals.

Ratio Sets the compression ratio, or the amount

of compression applied as your signal goes

above the threshold. For example, a 2:1 com-

pression ratio means that a 2 dB increase of level

above the threshold produces a 1 db increase in

output.

Knee Sets the sharpness of the gain curve the

compressor follows when reducing gain.

As you increase this control, it goes from apply-

ing “hard-knee” compression to “soft-knee”

compression:

• With hard-knee compression, compression

begins when the input signal exceeds the

threshold. This can sound abrupt and is ideal

for limiting.

With soft-knee compression, gentle compres-

sion begins and increases gradually as the input

signal approaches the threshold, and reaches

full compression after exceeding the threshold.

This creates smoother compression.

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American Audio DIGI-PRO User's Guide Page 54

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