Section 2 — Algorithms
34 ENSONIQ DP/4+ Reference Manual
EQ-TREMOLO-DDL
EQ-Tremolo-DDL combines an EQ and a tremolo effect, which is a pulsating change in volume,
with a digital delay.
EQ-Tremolo-DDL Signal Routing
Right
R
L
Main
Outputs
Left
Echo
Delay
Echo
Level
Input Level Trim
EQ
EQ
Tremolo
Tremolo
Regen
The signal enters an input level trim (parameter 17) followed by a programmable EQ, and is then
routed to the tremolo. The tremolo is routed directly to the output. The left channel signal
passes through the digital delay and is routed back into the delay. There is another signal from
the delay that is routed to the output on the right side. One Regen parameter (09) between the
delay sends controls the left and right delay level. This constitutes the “ping-pong” effect. There
are two echoes that are sent to the left and right outputs respectively. The signal from the two
discrete 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.
03 — Tremolo Rate Range: 000 to 200
Sets the rate of modulation. Mid values create a faster wavering sound. High values will raise
the level up into the audio range, creating a ring modulation (amplitude modulation) effect. This
parameter, when used in conjunction with the Sample & Hold Rate parameter, can create some
interesting staccato effects.
04 — Tremolo Depth Range: 00 to 99
This parameter sets the depth of amplitude modulation. Because this algorithm features a multi-
shaped LFO, optimal settings are around 50. Higher values create a wider separation of the LFO
curve.
05 — Left/Right LFO Range: Out-of-Phase or In-Phase
Controls whether the left and right channels of the stereo tremolo will modulate in or out-of-phase.
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