Modular Synthesizer Projects from Oakley Sound Systems

The Oakley Modular Catalogue


MOTM (5U) Format

Oscillators

Dual-LFO
Two versatile low frequency oscillators in one single width
module

Slim-VCO Single width oscillator
VC-LFO Voltage controlled audio and low
frequency oscillator

VCO Superb sounding and full featured
oscillator for classic analogue power

VCO controller Master control over VCO pairs with onboard
vibrato LFO

Amplifiers

Classic VCA Vintage voltage controlled amplifier based on
the discrete circuitry of the 2600

VCA-X A dual and quad voltage controlled
amplifier module based around the 2164 with mixing
capabilities

Filters

COTA
Multimode voltage controlled filter based on the classic
cascaded integrator design

Croglin Dual filter with a very unusual
topology

Diode
Superladder Filter

Discrete four stage diode ladder low pass and band pass
filter

Discrete Ladder
Filter
The classic 904A
filter revisited
s
Human Voice
Module
Fixed filter
bank designed to replicate a classic electronic vocal sound

Journeyman
Diode Ring Filter
A
discrete VCF full of charactere.

State Variable
Filter
Two pole true
multimode VCF

Transistor
Superladder Filter

Moog style low pass and band pass filter

Envelopes

ADSR/VCA
A looping ADSR envelope generator and VCA in one

VC-ADSR Fully voltage controlled looping ADSR and VCA
Versatile Ramp
Generator
Variable
symmetry oscillator, slew, envelope generator, trigger delay
and more

Utility
Modules

EFG
Envelope Follower, Gate Extractor and Pre-amp in one

Fourmix Simple but effective four channel
audio and CV mixer

Multimix Versatile three way mixer for DC and
audio

Noise/Filter Analogue noise and voltage controlled
filter module

Router Quad output amplifier/invertor and
multiple

Sample/Slew Very useful sample and hold design
with separate slew generator, clock generator and noise
source.

Effects

Discontinuity Waveshaper, wavefolder, ring modulator, wave
splicer, clipper and rectifier module

Deep Equinoxe Voltage controlled eight stage OTA
phaser

Equinoxe Voltage controlled OTA phaser
Flanger/Chorus Voltage controlled delay line module for chorus,
flanging and other pitch effects

MOSPhaser Voltage controlled six stage MOSFET
phaser

Overdrive-II A well featured Overdrive and Harmonic
Multiplier module

Power Supplies

Power Supply An LM317/337 based power supply module for
small to medium sized 5U systems

Dizzy (MOTM) Power distribution board for the MOTM
format

Dizzy (MU) Power distribution board for the MU
format

Obsolete

midiDAC
Single channel midi to CV convertor


Eurorack Format

Sequencers

Eight stage analogue sequencer Two channel sequencer with skip, reset
and multistage parallel loading

Amplifiers

Classic VCA Vintage voltage controlled amplifier based on
the discrete circuitry of the 2600

Oscillators

Dual VCO
Two classic sawtooth core oscillators in 14HP

Filters

COTA
Multimode voltage controlled filter based on the classic
cascaded integrator design

Croglin An unusual dual filter module with a
complex sound in a compact package

Discrete
Ladder Filter

Transistor ladder filter and distortion circuit based on the
classic designs from the 1960s

Journeyman Diode ring dual mode filter based on
the distinctive Traveller filter from the 1970s

Human Voice
Module
A fixed filter
bank designed specifically to recreate the famous vocal
sounds from a well known keyboard

MOSPhaser Voltage controlled six stage MOSFET
phaser

SVF Multimode voltage controlled state
variable filter

Utility
Modules

Multimix
Versatile three way mixer for CV and audio

Envelope
Generators

Envelope
An excellent ADSR module with looping feature

Power Distribution

Euro Power Supply Power supply module for small to medium sized
eurorack systems

Euro Dizzy Power distribution board for eurorack


Copyright: Tony Allgood.
Last revised: January 05, 2026.