Behringer V-TONE GUITAR DRIVER DI GDI21 Quick Start Manual Download Page 1

Thank you for showing your confidence in us by purchasing the V-TONE GUITAR GDI21. 
This high-quality guitar modeling driver is designed for hands-on musicians 
and no-frills types. We have rebuilt different circuitries and components from 
famous amps, and packed them into one housing. You can alternate between 
several different amp re-creations, gain settings and mic placements with a flick of 
a switch—intuitively and with minimal effort. In addition, the GDI21 functions as 
standard ultra-transparent direct injection box when used in bypass mode.

A DI (Direct Injection) box allows you to send a signal directly from an unbalanced, 
high-impedance output (like an electric guitar) and connect it directly to the 
balanced mic input of a mixing console.

Whether for stage, recording, rehearsal or warm-up, BEHRINGER’s V-TONE 
GUITAR GDI21 is a natural choice for all players who want an arsenal of different tones.

1.  Control Elements

Control elements

(1) 

The 

DRIVE

 control adjusts the overall amount of gain and overdrive, 

similar to pushing the output section of a tube amp.

(2) 

The 

TREBLE

 control governs the high-frequency range of the signal (

±

12 dB).

(3) 

The 

BASS

 control allows you to boost/cut the low-frequency range (

±

12 dB).

(4) 

The 

LEVEL

 control adjusts the output level of the GDI21.

(5) 

Use the 

AMP

 switch to select one of three great classic tube amps. You will 

recognize these classic amp tones as soon as you hear them. For crystal-clear, 
transparent sounds with dynamic bass select TWE(E)D. For aggressive mids 
and incredible sustain select BRIT(ISH). Rounder and more evened-out (yet 
still sophisticated) sounds can be dialed up if you select CALIF(ORNIAN); it’s 
perfect for leads.

(6) 

Use the 

MODE

 switch to dial up one of three gain settings (HOT, HI G(AIN), 

CL(EA)N) that you want to combine with the amp setting.

(7) 

The 

MIC

 switch simulates the microphone placement (orientation and 

distance) in relation to the cabinet. Select CL(AS)SIC (distant mic placement 
without ambience) to achieve high mid-range content and a greater 
definition of notes like with classic early tube amps. In C(E)NT(E)R 
(close miking at the center of a cone) you get greater high mid-range content 

and increased low-end for mega crunchy results. OFF (A)X(IS) (close miking 
at the edge of a cone) is very similar to CENTER, but produces a smoother, 
softer sound with less upper mid-range content; perfect in combination with 
MODE position HOT.

(8) 

When activated, the 

GND LIFT

 disconnects the ground connection between 

input and output. Depending on the grounding of the connected equipment, 
this can eliminate hum or ground loops.

(9) 

Use the footswitch to activate/deactivate all the tone functions 
(EQ, DRIVE, modeling). When deactivated, the GDI21 functions solely 
as a standard transparent DI box.

(10) 

This LED illuminates when the effect is activated (see  

(8)

).

Connectors

(11) 

Use this ¼" TS 

INPUT

 connector to plug in the instrument cable of your guitar 

or other instruments.

(12) 

BAL OUT

 is the GDI21’s balanced mic level output. Use a high-quality, 

balanced XLR (microphone) cable to connect the driver to a mixing console.

(13) 

The unbalanced ¼" TS 

OUT

 connector sends the signal to your guitar amp.

Bottom of the GDI21

(14) 

SERIAL NUMBER

. The serial number of the GDI21 is located at the bottom.

(15) 

BATTERY COMPARTMENT

. Open the lid to install or replace the 9 V battery.

◊ 

The GDI21 is powered as soon you insert a plug into the INPUT. 
The battery is “disconnected” when the plug is removed. For this 
reason, the GDI21 has no on/off switch. To prolong battery life, 
always disconnect the input when the driver is not in use.

(1)

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(4)

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(3)

(6)

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(11)

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(15)

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V-TONE GUITAR DRIVER DI GDI21

Guitar Amp Modeler/Direct Recording Preamp/DI Box

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