ST MODULAR
EFI is an analog multi-mode filter that draws inspiration from the iconic KORG MS-20 filter, refined to seamlessly fit within a compact 4 HP module. Celebrated as one of our top-performing modules, EFI stands as an essential addition to smaller modular setups, allowing you to save valuable HP without compromising on functionality.
key features
Analog Dual-Mode-Filter
Filter Modes: LP, HP (+ LP Overdrive via Jumper)
Resonance Control
Two CV Inputs
Two CV Attenuators
Wrong Polarity Protection
specs & downloads
width: 4 HP
depth: 28 mm
power: 26 mA @ +12V / 24 mA @ -12V
videos
description / manual
The front panel features a switch for easy toggling between Low Pass and High Pass Modes. Alongside, you'll find two CV inputs, each equipped with its own attenuator for precise control.
The filter easily enters self-oscillation via the Resonance control. In addition to Lowpass and Highpass modes, a third mode can be activated via a rear-panel jumper. In Lowpass mode without the jumper placed onto the connector pins, increasing Resonance produces smooth, liquid-like overtones. And with Resonance maxed out, the filter goes wild.
Building this module is a breeze, requiring only 24 readily available components, making it an accessible DIY project.