Programming instructions
Section 6 — Effect Parameters
Edit/Effect Parameters 41
ROM-45 INVRS EXPNDR
INVRS EXPNDR 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 that has filtering in only the side chain path.
Threshold
Time
Signal Level
Pass
Boost
The parameters available for this algorithm are:
EXPANSION RATIO Range: 1/1 to 40/1, INF
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 by three times. We recommend starting with settings near 1/1 (a setting of
exactly 1/1 disables expansion).
THRESHOLD Range: -96 to +0 dB
This parameter 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.
ATTACK TIME Range: 50µs to 100ms
This parameter determines the time after the initial signal amplitude has been detected for the
expansion to take affect.
RELEASE TIME Range: 1ms to 10.0s
This parameter determines how long it takes for the expansion to be fully deactivated after the
input signal rises above the threshold level. This is generally longer than the ATTACK TIME.
GATE OFF Range: -96 to +0 dB
This parameter sets the lower threshold level at which the noise gate shuts off the audio.
GATE ON Range: -96 to +0 dB
This parameter sets the upper threshold level at which the noise gate passes audio. This second
parameter provides hysteresis.
BASS FC Range: 0 to 1000 Hz
This parameter sets the cutoff frequency of the lower frequency band shelving filter.
GAIN Range: -48 to +24 dB
This parameter sets the amount of boost or cut applied to the low shelving filter.
TREBLE FC Range: 1KHz to 15KHz
This parameter sets the cutoff frequency of the upper frequency band high shelving filter.