The Effects Explained; Comp/Limiter (Compressor/Limiter) - Boss GT-6B Owner's Manual

Chapter 4 The Effects Explained
This chapter describes the particular qualities of each of the
GT-6B's internal effects, as well as the parameters used to
control them.
The sound that is input to each effect is called the "direct
sound," and the sound modified by the effect is called
the "effect sound."
All product names mentioned in this document are
trademarks or registered trademarks of their respective
owners.
The names used for the sounds mentioned in this
document are intended to be descriptive in nature, used
solely to identify the equipment whose sound is
simulated using COSM technology.
COMP/LIMITER
(Compressor/Limiter)
The compressor is an effect that compresses (or attenuates)
loud input levels and expands (boosts) low input levels, thus
evening out the volume to create sustain without distortion.
It also has the effect of evening out the sound.
The limiter is an effect that prevents distortion by
suppressing input signals that exceed a set value (threshold).
You can get the same effect achieved with the compressor by
setting the threshold at a low value.
The GT-6B's COSM technology provides you with four types
of modeled compressor/limiter perfectly suited for the bass.
Parameter Value
On/Off Off, On
Type BOSS Comp, D-Comp, Rack 160D,
Vtg Rack U
Attack 0–100
Sustain 0–100
Threshold 0–100
Ratio 1:1– :1 (Rack 160D)
4:1– 20:1 (Vtg Rack U)
Release 0–100
Tone -50–+50
Level 0–100
On/Off
Sets the compressor/limiter effect to ON or OFF.
Type
Selects the compressor/limiter type.
BOSS Comp Models the BOSS CS-3
D-Comp Models the MXR dyna comp.
Rack 160D Models the dbx 160x.
Vtg Rack U Models the UREI 1178.
Attack
(with BOSS Comp, D-Comp)
Adjusts the strength of the picking attack when the strings
are played. Higher values result in a sharper attack, creating
a more clearly defined sound.
(with Vtg Rack U)
This adjusts the amount of time that is to pass between the
point at which the input level exceeds the set threshold level
and compression begins, and the time at which the
compression ratio set with the Ratio setting is achieved.
Compression is applied more rapidly as the value is
increased.
Sustain
(with BOSS Comp, D-Comp)
Boosts low-level signals, adjusting the time over which
sounds are sustained. Higher values deepen the effect,
resulting in a longer sustain.
Threshold
(with Rack 160D, Vtg Rack U)
Adjust this as appropriate for the input signal from your
bass. When the input signal level exceeds this threshold
level, limiting will be applied. The limiter goes onto effect at
lower levels as the value is reduced with Rack 160D.
This controls the input level with Vtg Rack U. Increasing the
value deepens the effect.
("Thres (input)" appears in the display.)
Ratio
(with Rack 160D, Vtg Rack U)
Adjusts the limiter compression ratio. Higher values create a
stronger compression effect.
Release
(with Vtg Rack U)
This adjusts the time from when the signal level drops below
the threshold until when the compression is removed. The
higher the values set, the more rapidly the compression is
released, and the more clearly the sound from the next string
played is heard.
Tone
(with BOSS Comp)
Adjusts the tone. The higher the value set, the more the high
frequencies are boosted, resulting in a harder sound.
Level
Adjusts the volume.
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