88 Series Outboard / 8801 Issue 7.3
Gain Reduction
The red meter indicates the gain reduction in dB applied by the compressor.
Expander/Gate
The Expander/Gate has knobs for:
• Hysteresis variable from 0dB to 25dB, & pressing Hysteresis knob
selects Expander mode
• Threshold variable from –30dBu to +20dBu, & pressing Threshold knob
selects Key Input
• Range variable from 0dB to 60dB, & pressing Range knob toggles
Normal (0.5ms) and Fast (0.05ms) Attack time
• Release time: 10ms to 3s, & pressing Release knob selects Invert
(Ducker)
Key Input
Key input is selectable by pressing on the Threshold knob (the key input is
on the rear panel D-Type connector).
When enabled the sidechain uses the Key Input signal rather than the signal
picked up at the input of the Dynamics gain stage as the control signal for
the Dynamics processing.
Hysteresis
The Hysteresis knob sets the difference in threshold for signals that are
rising or falling in level.
Signals that are rising in level turn on when the level reaches the threshold
level plus the hysteresis value.
Signals that are falling in level turn off at the Threshold level. Raising the
threshold for rising signals prevents noise turning the gate on, also, allowing
a lower threshold for falling signals to prevents reverb signal tail being
prematurely gated.
For example, if the threshold is set at -30 and the hysteresis is set at 10, the
signal level would have to rise above -20dB before the channel turns on and
the channel would remain on until the signal level fell below -30dB.
Expander
Pressing the Hysteresis knob switches the gate off and the 2:1 ratio
expander on. The Expander led lights to indicate Expander mode.
Invert/Ducker
Pressing the Release knob inverts the behaviour of the Gate. This function is
sometimes called a “ducker”. The Invert led lights to indicate that the Gate
is in Invert mode.
The function is normally used with an external key input.
When gating, a signal above the threshold level on the key input allows signal
to pass; when ducking a signal above the threshold level on the key input
causes the gain of the channel signal to be reduced by the amount set on the
Range knob.
Gain Reduction
The green meter indicates the gain reduction in dB of the gate.
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