Section 2 — Algorithms
ENSONIQ DP/4+ Reference Manual 43
03 — Attack Range: 1ms to 10.0s
Sets the attack time of the gated reverb once the incoming signal has reached the trigger level.
Generally the attack should be short and not set longer than the Hold Time. This parameter
should not be used to achieve a reverse reverb envelope, because here the attack volume
increases whereas in the Reverse reverb the attack volume accelerates.
04 — Hold Time Range: 1ms to 10.0s
Sets the amount of time that the reverb will hold after the retrigger and before the release. The
Hold Time will begin again if retriggered (see diagrams).
05 — Decay Range: 0.20 to 100.0 sec.
Sets the decay rate much like in the Reverse Reverb algorithm. In general, the decay rate is set
very high. Decay rate is not offered as a controllable parameter in the Reverse Reverb, but the
DP/4+ brings it out here for special effect when low values are used.
06 — Release Time Range: 1ms to 10.0s
Sets the amount of time after the Hold Time has elapsed for the gated reverb to shut down.
Generally these times are very short.
07 — Trigger Threshold Range: -96 to +00 dB
Sets the signal level that triggers the gated reverb. When the incoming signal reaches this value,
it triggers (starts) the gated reverb. Higher values would require a stronger incoming signal. Set
this parameter as low as possible to work with your particular source, but not too low so as to
cause false triggering.
08 — Retrigger Threshold Range: -96 to +00 dB
This parameter sets the level at which the gated reverb will retrigger. For precise Hold Time that
begins at the onset of the incoming source, this parameter should be set higher than the incoming
signal to prevent retriggering (as shown in the diagrams). After the incoming signal reaches the
trigger threshold, the gated reverb is activated. Every time the signal reaches the retrigger
threshold, the gated reverb will retrigger causing the Hold Time to restart.
If the level of this parameter is set lower than the incoming signal, the gated reverb will continue
to retrigger as shown in the diagrams. With a high Decay Rate (parameter 05), this adds a
cavernous quality to percussion instruments.
09 — HF Damping Range: 00 to 99
Controls the rate of attenuation of high frequencies in the decay of the reverb. Increasing the
value of this parameter will gradually filter out increasing amounts of high frequency energy.
We recommend a setting of 00.
10 — Diffusion 1 Range: 00 to 99
Smears the transients, so as to diffuse and smooth the sound. Lower values will cause impulsive
sounds to appear as a series of discrete echoes, while higher values tend to increase the smear
(smoother sounding). Recommended setting is approximately 50.
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