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562E

The 562E Auto Windowing Expander Gate can provide signal processing capabilities ranging from
essential to esoteric. Some of the following techniques are standard and straightforward. Other
techniques may be used less commonly, but are worthy of investigation. These examples are
intended to give you some sample setups that you can use right away, but they are not intended to
represent every possible use of the Symetrix 562E.

Perhaps the most common use for gates in music production is on drum and percussion tracks. In
addition, gates may be used on virtually any type of musical instrument or audio sound effect to
remove unwanted room noise and ambience, to modify reverb and other time-related effects, and to
create special effects.

The downward expander is ideal for tasks requiring more subtle control. Expanders can provide
single-ended noise reduction for tape recorders, workstations, effects devices, companding (when
used with a compressor), and noise and interference suppression for studio and live sound.

Noise Elimination

The 562E is capable of eliminating noise on a track or channel that becomes objectionable when
not masked by the desired signal. For general and gentle noise suppression (especially on voice),
use expansion. For more “hardline” noise suppression, use gating.

You can use the 562E to reduce body noises picked up by an announce microphone, to reduce amp
noise from a noisy guitar amp, or to reduce the amount of room sound in a guitar track that was
recorded a little too loosely in a room that was a little too noisy. For sound reinforcement, the 562E
is useful for tending an announce mic that needs to be left on, when you really don’t want it
picking up every whisper in its vicinity or going into feedback.

Setup for these applications is easy. With no signal and the G

ATE

ANGE

XPANDER

ATIO

control

either clockwise (for expanding) or counterclockwise (for gating), adjust the T

HRESHOLD

control

counterclockwise until you begin to see gain reduction on the LED display. Continue until you
hear the degree of expansion/gating that you want. When the signal is present, you may need to
refine the setting so that the 562E doesn’t reduce the gain during momentary pauses. You can slow
things down a bit via the H

OLD

and R

ELEASE

controls, which help prevent expansion/gating during

momentary pauses. Remember: The H

OLD

control only functions while gating.

Isolating and Tightening Up Drum Sounds

The damping effect achieved by applying duct tape to a drum head is very similar to the effect of
applying gating or expanding to the drums. The duct tape reduces the decay (sustain) of the
instrument, and helps get rid of annoying ring frequencies. Using the 562E to reduce the decay of
individual drums allows the drummer to play with the full power of his or her drums, at live perfor-

Applications

Chapter 8

CHANNEL 1

TIME

GATE RANGE

EXPANDER RATIO

500ms

HOLD

TIME

ATTACK

TIME

60ms