Eurorack Modules

Eurorack modules are standalone parts of a modular synthesizer in the Eurorack format, which you combine in a single case to build your own sound. Here you'll find oscillators, filters, VCA amplifiers, envelope generators, LFOs, sequencers, mixers, effects modules and audio interfaces. You connect the modules with patch cables fitted with 3.5 mm jacks, so you can patch the same setup differently every day. The range includes the brands Behringer, NANO, Bastl Instruments, Erica Synths, Dreadbox, Strymon and Roland with its SYSTEM-500 series.

What does the Eurorack format mean?

Eurorack is a shared standard for module dimensions and power, introduced by the German company Doepfer with its A-100 system and used by most manufacturers today. Every module is 3U (128.5 mm) high and its width is given in HP, where 1 HP equals 5.08 mm. Power comes through a ribbon cable from the bus board in the case, usually from the +12 V and −12 V rails. This lets you combine modules from different manufacturers in one case.

How do you check whether a module fits your case?

Look at three figures for every module. The width in HP tells you how much space it takes up in a row: the narrow Behringer 903A is 4 HP, the Strymon StarLab reverb is 28 HP. Add up the current draw in mA on the +12 V and −12 V rails for all modules and compare it with the capacity of the case's power supply. Compare the depth of the module with the depth of the case, especially with shallow portable cases.

Which modules form the core of your first system?

• Oscillator (VCO) generates the basic tone, for example the Behringer 921 or The Wave Transformer from EarthQuaker Devices.
• Filter (VCF) shapes the timbre of the sound, for example the Behringer Wasp VCF or 904A.
• Amplifier (VCA) and envelope generator determine how the tone starts and fades out.
• Sequencer and MIDI-CV converter control the melody from a keyboard or computer, for example the Behringer CM1A.
• Mixer and output module send the sound to headphones or a sound card.

You'll find ready-made cases, power supplies and complete systems in the Modular Systems category, and connecting cables in the Patch Cables section.