Boss Audio Systems GT-6B User Manual

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 “

,” and the sound modified by the effect is called 

the “

.”

The 

 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 

 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.

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

Sets the compressor/limiter effect to ON or OFF.

Selects the compressor/limiter type.

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.

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.

Boosts low-level signals, adjusting the time over which 
sounds are sustained. Higher values deepen the effect, 
resulting in a longer sustain.

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.)

Adjusts the limiter compression ratio. Higher values create a 
stronger compression effect.

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.

Adjusts the tone. The higher the value set, the more the high 
frequencies are boosted, resulting in a harder sound.

Adjusts the volume.

Models the BOSS CS-3

Models the MXR dyna comp.

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.

Models the dbx 160x.

Models the UREI 1178.