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Duende User Guide
Page 24 of 29
100 µs), a variable hold time from 0 to four seconds and a variable release time from 0.1 to 4
seconds.
The sidechain signal is sourced from the signal feeding the dynamics section and the filters and/or
equaliser can be inserted in this sidechain. The green LEDs indicate the amount of gain reduction
on the expander/gate.
By default, the Gate/Expander section functions as an Infinity:1 gate. When the EXP button is
pressed, the section becomes a 2:1 expander.
Detailed Parameter Description
RANGE: Determines the depth of gating or expansion. When turned fully anticlockwise (Range =
0), this section is inactive. When turned fully clockwise, a range of 40dB can be obtained.
THRESHOLD: A Variable hysteresis is incorporated in the threshold circuitry. For any given
‘open’ setting, the Expander/Gate will have a lower ‘close’ threshold. The hysteresis value is
increased as the threshold is lowered. This is very useful in music recording as it allows
instruments to decay below the open threshold before gating or expansion takes place.
RELEASE: This determines the time constant (speed), variable from 0.1- 4 seconds, at which the
Gate/Expander reduces the signal level once it has passed below the threshold. Note that this
control interacts with the Range control.
FAST ATT: Provides a fast attack time (100µs per 40db). When off, a controlled linear attack time
of 1.5ms per 40dB is selected. The attack time is the time taken for the Expander/Gate to ‘recover’
once the signal level is above the threshold. When gating signals with a steep rising edge, such as
drums, a slow attack may effectively mask the initial ‘Thwack’, so you should be aware of this
when selecting the appropriate attack time.
HOLD: Determines the time after the signal has decayed below the threshold before the gate
closes.
Variable from 0 to 4 seconds.
Note that when the Dynamics Section is not in circuit, its sidechain input is also bypassed.
Output Section
The Output Section consists of a ±20dB output gain control, and a 6-segment LED meter.
S/C LISTEN: Pressing the SC LISTEN switch routes the sidechain directly to the output, so you
can monitor the sidechain signal