Gated Reverb - ENSONIQ DP/4+ Reference Manual

Section 2 — Algorithms

GATED REVERB

Gated Reverb provides an excellent gated reverb. When the output of a reverb is muted partway
through it's decay, it creates a gated sound. To achieve this gated effect, both the Gated and
Reverse reverbs must gate a number of internal parameters, not just the output amplitude
envelope. It is however, the output amplitude over which the user has control. The DP/4+ offers
a highly controllable gated reverb, optimized for percussive instruments, but useful for any
signal. The gate is first opened when the input signal passes the trigger threshold. This trigger
threshold should be set as low as possible, so that none of the input signal is missed. The gated
reverb is distinguished from the reverse reverb by retriggering whenever the input signal passes
a retrigger (user programmable) threshold (see diagrams). The gate will stay open as long as the
input signal remains above the retrigger threshold, and all the input signals will be accumulated
under this gate until the total input signal level falls below the retrigger threshold. When this
happens, the Hold Time will begin (as shown in the diagram below). The reason for two
thresholds is to eliminate false retriggering and to ensure precise hold time durations. If you
desire a separate gate on each and every note, use the Non Lin reverbs. The topology for the
Gated Reverb is derived from the Plate Reverb.
Gated Reverb with a High Retrigger Threshold
Level
Gated Reverb with a Low Retrigger Threshold
Level
01 — Mix
02 — Volume
See the descriptions under the Mix and Volume Parameters, in the beginning of this section.
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Hold Time
Attack Time
Signal
Time
Hold Time
Hold Time
Hold Time
Hold Time
Hold Time
Hold Time
Signal
Time
Release
Hold Time
Hold Time
Hold Time
ENSONIQ DP/4+ Reference Manual
Retrigger
Trigger
Retrigger
Trigger