ENSONIQ DP/2 Specifications download pdf (Page 73)

Section 2 — Algorithms

ENSONIQ DP/4+ Reference Manual 57

KEYED EXPANDER

Keyed Expander operation is identical to the Expander. The only difference is that the left signal

(Input 1) is expanded as determined by the key. The key is the right channel signal (Input 2). This

effect is often used in studios to “tighten” rhythm tracks (e.g., a rhythm guitar in Input 1 is tightened

by a different signal, like a drum machine connected to Input 2).

☞ Important: This special algorithm is only made available in the DP/4+ as a 2-Unit ROM

Preset (location #86), because it requires special input signal routing.

Keyed Expander Signal Routing

Right

Main

Output

Left

Expander

Filtering

(side chain)

Side Trim

Keyed

Expander

Output

Mixer

01 — Mix

02 — Volume

See the descriptions under the Mix and Volume Parameters, in the beginning of this section. The

Mixer works as in all the other algorithms, and is distinct from the output mixer shown in the

diagram above.

03 — Exp Ratio Range: 1:1 to 1:40, infinity

Sets the amount of expansion. The range is based on decibels (dB) below the threshold. If this is

set to 1:4 for example, it will expand changes in signals below the threshold by a factor of four.

When this is set to infinity, it acts as a gate. A setting of 1:1 offers no expansion.

04 — Exp Threshold Range: -96 to +00 dB

Sets the threshold level. Signals that exceed this level will be unaffected, while signals that are

below will be expanded. To turn off the expander, set the level to -96 dB.

05 — Gain Change Range: N/A

This read-only parameter displays the amount of gain reduction in real time.

06 — Exp Attack Range: 50µs to 100ms

Determines the attack rate after the initial signal has been detected and before the expansion

takes affect.

07 — Exp Release Range: 1ms to 10.0s

Determines the release rate after the signal has been detected below the threshold level. This is

generally chosen longer than the attack time (parameter 06).

08 — Expander Gate Hold Time Range: 1ms to 10.0s

This is the detection sustain time in the ADSR which constitutes attack, sustain, and release.

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ENSONIQ DP/2 Specifications Page 73

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