Section 2 — Algorithms
100 ENSONIQ DP/4+ Reference Manual
08 — Post-Distortion VCF Fc
09 — Post-Distortion VCF Q
10 — Envelope Follower to Post VCF
These three parameters are identical to the previous parameters, and are used to control the
second VCF that exists after the distortion.
11 — Envelope Follower Attack Range: 50µs to 10.0s
Sets the attack of the envelope follower (i.e. determines how closely the attack is followed) once
the incoming signal has been detected. Generally the attack should be short.
12 — Envelope Follower Release Range: 1ms to 10.0s
Sets the amount of time after the incoming signal has ceased for the envelope follower to shut
down. Generally these times are longer than the attack times.
13 — Distortion Bypass Range: Off or On
This parameter allows you to bypass the distortion (as shown on the signal routing diagram).
14 — Pre-EQ High Pass Cutoff Range: 0 to 1000 Hz
Filters out the low frequencies before the EQ. The higher the value, the less low frequencies will
pass through.
15 — Speaker HighPass Cutoff Range: 4 to 1000 Hz
This parameter filters out the low frequencies of the main amp prior to the speaker. The higher
the value, the less low frequencies pass through.
16 — Amp Feedback Amount Range -99 to +99
Controls the amount of feedback allowed to pass from the post-distortion VCF Envelope
follower to in front of the pre-EQ high-pass cutoff filter. The sign of the value determines the
polarity of the regen.
17 — Amp Feedback HF Damping Range: 00 to 99
This filter controls the rate of attenuation of high frequencies in the feedback signal. Increasing
the value of this parameter will gradually filter out increasing amounts of high frequency energy.
18 — Amp Feedback Delay Range: 000 to 127
This is a very fast delay and is used to “tune” the feedback signal.
Mod1 Source Mod2 Source
Mod1 Destination Mod2 Destination
Mod1 Param Range Min Mod2 Param Range Min
Mod1 Param Range Max Mod2 Param Range Max
See the descriptions under the Algorithm Modulators, found in the beginning of this section.
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