Section 2 — Algorithms
36 ENSONIQ DP/4+ Reference Manual
EQ - VIBRATO - DDL
EQ-Vibrato-DDL combines an EQ and a vibrato effect (a pitch shifter modulating over a very
small range), with a digital delay. Many vintage guitar amplifiers offered a vibrato control, but
don’t feel that this algorithm is limited to guitars; try this with other sources as well. There is a
sample & hold parameter that doesn’t hold the instantaneous pitch shift, but if set properly will
provide a “chirping” effect when acting on the input signal.
EQ - Vibrato - DDL Signal Routing
Right
EQ
R
EQ
L
Main
Outputs
Left
EchoDelay
Vibrato
Vibrato
Regen
Echo
Level
Input Level Trim
The signal enters a programmable EQ, which is preceded by an input level trim (parameter 17).
The signal is then routed to the vibrato. The vibrato is routed directly to the output. The vibrato
also passes through the delay which is then regenerated back into the delay. A different delay
signal is routed to the output on the right side. This constitutes a “ping-pong” delay effect. The
Regen parameter between the delay sends controls the delay feedback amount. There are also
two echoes that are sent to the left and right outputs respectively. The signal from the two echoes
has one level control. There is also an external dry signal (not shown) that goes directly from the
input to the output and is controlled with the mix parameter (01).
01 — Mix
02 — Volume
See the descriptions under the Mix and Volume Parameters, in the beginning of this section. This
algorithm sounds best when set to 100% wet (Mix=99).
03 — Vibrato Rate Range: 00 to 99
Sets the rate of modulation. Higher values create a faster vibrating rate.
04 — Vibrato Width Range: 00 to 99
This parameter adjusts the amount of the modulation.
05 — Left/Right LFO Range: Out-of-Phase or In-Phase
Controls the vibrato pitch direction of the left and right channels. When Out-of-Phase, the
(quadrature) pitch change on the left channel will lag 90˚ from the right. When In-Phase, both
channels will change pitch together.
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