ALM Busy Circuits PE-1

Name: PE-1
Brand: ALM Busy Circuits

Warm Portastudio-inspired dual band parametric EQ

5 HP Eurorack module

PE-1 is a dual band parametric equalizer with two sweepable frequency bands offering up to 12dB of boost or cut, inspired by the warm EQ circuits found in classic Portastudio 4-track cassette mixers. It functions as a simple two-channel mixer with a single attenuation control on one input. The module imparts a warm, musical character ideal for softening digital sources, sculpting live performances, or feeding feedback loops.

Features

Dual band parametric EQ with +/-12dB of boost and cut
Sweepable frequency selection for both low and high bands
Two AC-coupled audio inputs
Input 1 attenuation control for basic two-channel mixing
Single audio output
Inspired by classic Portastudio 4-track tape mixer EQ circuits
Warm analogue character suitable for softening digital sources
Reverse polarity protection
Skiff friendly low depth
Designed and made in the UK

Controls & Jacks (9)

Low Band Gain— Selects the center frequency of the lower EQ band
Low Band Frequency— Boost or cut the lower frequency band by up to ±12dB
High Band Gain— Selects the center frequency of the upper EQ band
High Band Frequency— Equalized audio output
Input 1— First audio input with attenuation control
Input 2— Second audio input
Input 2— Boost or cut the upper frequency band by up to ±12dB
Input 1 Attenuation— Controls the level of the first audio input for mixing purposes
Output— Equalized audio output

How-To Guides

Warming Up a Digital Oscillator
Basic Two-Source Mix with EQ
Taming a Feedback Loop
FM Drum Presence Boost
Live Performance Tone Shaping
Modular Mixer Extension with EQ
Ambient Texture Sculpting
Bass Tone Carving

Explore the interactive PE-1 panel on BleepDex — tap any control to learn what it does.