Section 2 — Algorithms
ENSONIQ DP/4+ Reference Manual 55
INVERSE EXPANDER
InversExpander creates sustain by expanding the signal so that the signal levels above threshold
are passed and levels below threshold are boosted to create a more even sound. A traditional
expander would have the opposite effect: that is a signal level below threshold would be
attenuated. An inverse expander is much like a compressor in so far as they both can be used to
create sustained sounds, and de-emphasize transient signals. EQ exists in both signal and side
chain paths, in contrast to the Expander which has filtering in only the side chain path.
Threshold
Time
Signal Level
Pass
Boost
01 — Mix
02 — Volume
See the descriptions under the Mix and Volume Parameters, in the beginning of this section. We
recommend a Mix setting of 99.
03 — Expnd Ratio Range: 1:1 to 40:1, Infinity
This parameter sets the amount of expansion. The range is based on decibels (dB) below the
threshold. If this is set to 3:1 for example, it will expand the changes in signals that are below the
threshold level 3 dB for each 1 dB change in the output. We recommend starting with settings
near 1:1 (a setting of exactly 1:1 disables expansion).
04 — Threshold Range: -96 to +00 dB
This sets the threshold level. Signals below this level will be boosted, while signals that are above
will be unaffected. As the input signal dies away below the threshold, the expander will increase
the signal gain. To turn off the inverse expander set the threshold to -96dB.
05 — Gain Change Range: N/A
This read-only parameter displays a gain increase meter.
06 — Exp Attack Range: 50µs to 100ms
Determines the time after the initial signal amplitude has been detected for the expansion to
occur.
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