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Behringer 1003 Dual Envelope Generator Module

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Product Information

Modular Synthesis

The first 2500 series synth modules came out in the 70s and tended to be extremely expensive. They were mainly all discrete transistor designs with some op-amps as at the time op-amps were high cost. The discrete circuitry gave the modules a very distinctive sound and were used by artists like The Who, Jean Michel Jarre, Vangelis, Kraftwerk and so many more, giving us some of the greatest records and film soundtracks we’ve ever heard. Modular synths were a landmark development in electronic music and today, it’s about to get better.


This is the Behringer 2500 series DUAL ENVELOPE GENERATOR MODULE 1003. An authentic reproduction of the original “System 2500” circuitry from the 70’s that can fit in a standard Eurorack case. The best part? It’s at a very affordable price. Mix the DUAL ENVELOPE GENERATOR MODULE 1003 in with your existing rig or start your modular synth journey from here. Either way you’re sure to have a lot of fun.

Start Sculpting

The 1003 Module allows you to create a deeply contoured signal with its 8 independent controls for Attack Time, Initial Decay Time, Sustain level from 0 to 10 Volts and Final Decay Time. Create snappy and percussive sounds or long evolving drones perfect for a funky groove or a brooding soundtrack to your latest cyberpunk epic.

Ins and Outs

For a more flexible setup each envelope generator comes with Manual Gate switches that you can press to start the envelope cycle; the 1003 features both gate and trigger inputs, in single mode you can use the gate input to start the envelope cycle, in multiple mode the trigger input can re-trigger the envelope cycle when a gate signal is present. You can connect an external gate and trigger system like a keyboard via 3.5mm TS cables as well as 4 outputs to send the envelopes to other modules in both negative and positive polarity.

Eurorack Ready

Installing the DUAL ENVELOPE GENERATOR MODULE 1003 is easy as it is designed to fit into a standard Eurorack case. Just connect the power cables to the power supply and screw in the module using the included screws. This allows for the 1003 to be mixed with other synth modules for a truly unique set up.


Whether you’re just getting into modular synths or looking to complete your collection, the DUAL ENVELOPE GENERATOR MODULE 1003 from Behringer is a great tool to have when creating amazing music.

Get the DUAL ENVELOPE GENERATOR MODULE 1003 from your local Behringer dealer today!

  • Classic 1003 dual analog ADSR generator module from the '70s

  • Authentic reproduction of the circuitry from the "2500" Series

  • Contains 2 identical envelope generators for creating control signals

  • 4 adjustable parameters: Attack, initial Decay, Sustain, final Decay

  • Each envelope is initiated by Gate and Trigger signals

  • Switchable between 2 operating modes for added flexibility

  • Single trigger mode uses only the gate signal to control the envelope

  • Multi trigger mode uses a positive trigger pulse to re-trigger the envelope while a Gate signal is present

  • Manual gate operation via front panel push button with LED for gate signal indication

  • Eurorack specs: 16 HP, XX mA +12 V, XX mA -12 V



3.5 mm TS jack, DC coupled


>35 kΩ

Gate threshold

+4 V

Max input level

+12 V


3.5 mm TS jack, DC coupled


>20 kΩ

Trigger threshold

+4 V

Max input level

+12 V

Out A

2 x 3.5 mm TS jacks, DC coupled


1 kΩ

Max output level

-10 V or +10 V

Out B

2 x 3.5 mm TS jacks, DC coupled


1 kΩ

Max output level

-10 V or +10 V


1 ms to 2 s

Initial decay

5 ms to 7 s


0 to 10 V

Final decay

6 ms to 8 s

Trigger modes

Single - gate controls envelope Multiple - trigger pulse + gate controls envelope

Manual gate

Envelope cycle start

Power supply


Current draw

40 mA (+12 V), 20 mA (-12 V)


42 x 81 x 129 mm

(1.7 x 3.2 x 5.1")

Rack units

16 HP


0.16 kg (0.35 lbs)


3 Years Warranty

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