Section 6 — Effect Parameters
ASR-10 Musician’s Manual
38
Edit/Effect Parameters
ROM-43 EXPANDER
EXPANDER performs downward expansion of input signals. For high expansion ratios this
algorithm functions as a gate. This algorithm operates by expanding (attenuating) signals below
the threshold and passing the signals above the threshold. The Threshold is a parameter defined
by the user. This algorithm can be used to eliminate noise. There is no EQ in the audio path;
high and low pass filtering is provided on the side chain only. This algorithm possesses two
unique features:
1) The ADSR in this algorithm has Attack, Sustain, and Release (the sustain is called the HOLD
TIME).
2) This algorithm contains a trigger mask function. This function is used primarily to extract a
click track from drum tracks. Once triggered, this function inserts a zero signal level into the
side chain detector for an amount of time determined by the user. This function becomes
triggered if TRIGGER MASK is enabled and if the side chain signal falls below the Trigger
MASK THRESHOLD.
Threshold
Time
Signal Level
Pass
Attenuate
EXPANSION RATIO
Range:
1/1 to 1/40, INF
This parameter 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.
THRESHOLD
Range:
-96 to +0 dB
This parameter 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.
ATTACK TIME
Range:
50µs to 100ms
This parameter determines the attack rate after the initial signal has been detected and before the
expansion takes affect.
RELEASE TIME
Range:
1ms to 10.0s
This parameter determines the release rate after the signal has been detected below the threshold
level. This is generally chosen longer than the ATTACK TIME.
HOLD TIME
Range:
1ms to 10.0s
This parameter is the detection sustain time in the ADSR that constitutes attack, sustain, and
release.
EQ GAIN
Range:
-48 to +48 dB
This parameter controls the amount of boost applied to the output signal of the high/low pass
filter. This accounts for insertion loss through those filters.
HIGH PASS FC
Range:
4 to 8000 Hz
This sets the cutoff frequency of the lower frequency band high pass shelving filter.
LOW PASS FC
Range:
100 Hz to 15 KHz
This parameter sets the amount of boost or cut applied to the low pass filter.
