Discrete Ladder Filter

Rework of Moog's classic 904A filter and CP3 mixer

Oakley Sound System's Discrete Ladder Filter built by Lower West Side Studio

If you desire that thick Moog low pass sound then the Discrete Ladder Filter by Oakley Modular Systems might fit your needs perfectly. This module is a reworking of the classic 1960’s low pass filter module using the circuits from the 904A filter and CP3 mixer and combining them into one excellent sounding module. The module also features a drive control which allows you to heavily overdrive the filter circuit without producing a big change in output volume.

The Discrete Ladder Filter comes in a 2U width with 1″ (25.4mm) knobs controlling 6 potentiometers. 3 of these controls are for mixing Inputs 1, 2 & 3. The remaining potentiometers control Frequency, Resonance, Drive and Depth for CV Inputs 1 & 2

A 1V/Oct input available for keyboard tracking.

The module operates at +/- 15V and comes with a Synthesizers.com style power connector.


  • 80 mA +15V
  • 55 mA -15V
  • ? mA 5V
  • Ø 4.00 (1 Votes) Average Rating

This Module is currently available.

submitted Oct 10th 2016, 23:04 by Flareless | last Change Mar 27th, 10:54 by Flareless