Yamaha GC2020C Owner's Manual: What's An Expander/gate; Setting Up The Expander/gate

Yamaha compressor/limiter owner's manual.
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What's an Expander/Gate?

The GC2020C features a expander/gate that is independent
of the compressor/limiter. Expander/gate is a function that
effectively eliminates hum or noise that would otherwise be
heard during silent portions of the program. It works by
closing the gate to cut off the output signal when the input
signal falls below a specified level (the gate threshold level).
• EXP GATE Function
INPUT SIGNAL
Setting Up the Expander/Gate
1. Adjust the input level so that the PEAK indicator just
lights up at the loudest signals.
2. Without playing the instrument, gradually raise the Gate
Threshold Level, and set it at a position slightly above the
point where noise is no longer audible.
3. Input a signal and check that its decay is not cut off
unnaturally for the most softly played notes. If the tail
end of the decay is cut off, lower the Gate Threshold
slightly.
Music Signal
Noise
Time
What's an Expander/Gate?
Normally you will set the gate level below the lowest level of
the musical portion, so that the gate will always be "open"
during the music to let the signal pass. Hum or noise that is
lower in level than the music will thus be effectively elimi-
nated.
OUTPUT SIGNAL
Music Signal
Noise
Signals in
Signals in
this range
this range
muted
muted
Time
GC2020C Compressor/Limiter Owner's Manual
5
Expander gate
threshold level
Signals in
this range
muted

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