Boss Audio Systems GT-6B owner manual Effects Explained, Compressor/Limiter

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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.

Chapter 4

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Contents Copyright 2002 Boss Corporation Printing Conventions in This ManualPage Page Placement Power SupplyMaintenance Memory BackupContents Contents Main Features Front Panel Panel DescriptionsCOMP/LIMITER p Compressor/Limiter Panel Descriptions REV/DLY p Reverb/DelayOVERDRIVE/DISTORTION p Chorus pFX-1 p Panel Descriptions WAH pFX-2 p Rear Panel Making Connections Playing SoundsAdjusting the Output Level Turning On the PowerSwitch on the Power switch on the GT-6B’s rear panel Next, turn on the power to the bass amp power ampHow to Switch Patches What is a Patch?Selecting Patches If the Patch Does Not Switch Turning Off the PowerSwitching Patches by Specifying the Bank and Number Turning Each of the Effects in a Patch On and OffGetting the Tones You Want- Fast EZ Tone Adjusting the Tones with the KnobsComp ATK Compressor attack Limiter THR Limiter thresholdCreating You Own Favorite Tones Patches Switch on and off To select another effect to be switched on and offAdding and Omitting Effects Repeat Steps 1Quick Setting Parameter whose settings are to be changedRotate the Value dial to select the effect setting you Rotate the Value dial to change the settings valuePedal Bend Using the Pedal Effects Wah, Pedal Bend, Ring ModulatorPress FX-2 Turn on the FX-2 effect Adding Effects p Ring Modulator Naming TonesPress FX-1 Turn on the FX-1 effect Adding Effects p Press NAME/NS/MASTER until Name appears in the displayAppears in the display Changing the Order of the Effects Effect ChainWrite Saving the Tones You Have CreatedCopying Patches Saving the Tones You Have Created Exchanging PatchesCompressor/Limiter Effects ExplainedOD Overdrive OD/DIST Overdrive/DistortionDST Distortion FUZ FuzzREV/DLY Reverb/Delay/ SOS Sound On Sound REV Reverb DLY DelaySOS Sound On Sound Reverb & DelayPreamp Speaker Effects Explained Direct Level WH Pedal WahFreq Frequency FX Select Effect SelectAW Auto Wah TW Touch WahOCT Octave FX-1ENH Enhancer Effects Explained RateDEF Defretter SG Slow GearEffects Explained Sens Mix LevelFX-2 PH PhaserHRM Harmonist FL FlangerPitch Shifter 2CE 2x2 Chorus PB Pedal BendASL Auto Slap Length SDD Short DelaySound HMN Humanizer VIB VibratoTrigger VowelSYN Bass Synth PWM Rate Pulse Width Modulation Rate Octave ShiftPWM Depth Pulse Width Modulation Depth Noise LevelQuick Settings p FV Foot VolumeManual Settings p NS Noise SuppressorSetting the Range of the Volume Change Settings for Using Expression PedalSetting the Pedal Functions Pedal Assign Making Settings Instantly Quick SettingsPedal Settings for the Expression Pedal Switch Pedal Settings for the CTL PedalSource Mode Editing Quick SettingsTarget Target Variation RangePress Pedal Assign Making the Assign On/Off SettingWhen using the foot switch Making the Parameter SettingsWhen using the expression pedal TargetSource Source ModeFor Foot Volume Setting the Pedal Functions Pedal Assign Active RangeExample Act. Range Lo 40, Act. Range Hi For Pitch ShifterMaking Custom Overdrive/Distortion Settings Using the Customize FunctionUsing the Customize Function Making Custom Pedal Wah SettingsProcedure Using Sound On SoundNumber 4 pedal Stop, Erase Using the Expression Pedal Even When Bypass Is in Effect Convenient Features of the GT-6BSwitching Bypass On and Off Switching the XLR Output Connector SignalsTuning the Bass Quick Patch Volume Adjustment Effect Level KnobAbout the Display During Tuning Convenient Features of the GT-6BChanging the Tuner Settings How to TuneStandard Pitch 435-445 Hz Adjusting the Output Level from Digital OUT Using the Digital OutNS Thrshold Noise Suppressor Threshold -20 dB-+20 dB Revrb Level Reverb Level 0%-200%Press Utility a number of times until Meter is displayed Checking the Effect Output Level with the Level MeterLimiting the Banks That Can Be Switched Bank Extent Adjusting the Display Contrast LCD ContrastSwitching Only the Number Other FunctionsPress the Bank or Bank pedal to select the desired bank Other Functions Switching the Bank and NumberPress a number pedal to select the patch you want to use ImmediateSelecting the PATCH/VALUE Dial Function Dial Function Setting Expression Pedal HoldOther Functions Patch No.& ValueSetting the Knob Functions Knob Mode What Can You Do with MIDI? Using MidiOperating From the GT-6B Controlling the GT-6B Remotely From an External Midi DeviceUsing Midi Making the Settings for Midi FunctionsMidi PC OUT Midi Program Change Out Off, On Midi Expression Pedal Switch Out Off, 1-31Midi EXP OUT Midi Expression Pedal Out Off, 1-31 Midi CTL OUT Midi Control Pedal Out Off, 1-31Transmitting Data to an External Midi Device Bulk Dump Transmitting and Receiving Midi DataMaking the Connections TransmittingReceiving Data from an External Midi Device Bulk Load When Receiving Data Saved on a Midi SequencerReceiving Press Exit to quit Bulk LoadInitial Program Change Map Settings Setting the Program Change MapUsing Midi About Midi AppendicesHow Midi messages are transmitted and received Main types of Midi message used by the GT-6BAbout the Midi implementation Factory SettingsAdjusting the Expression Pedal Restoring the Factory Settings Factory ResetAppendices SystemNo sound / Volume is weak TroubleshootingVolume level does not change with Foot Volume Can’t Change PatchesAppendices Midi messages are not transmitted Error MessagesReceived Midi Implementation Chart GT-6B Bass Effects Processor Main SpecificationsNumerics IndexLPF IndexTHR Memo Memo Avis G601744601