Oakley Sound Systems Modular Synthesizer Projects
As of Febraury 2026, Oakley Modular projects are now distributed and supported by synthCube
- News Specials and Updates
Friends of Oakley Sound Systems and Tony Allgood– we are delighted to announce that we have reached an agreement with Tony to support and distribute his modular synthesizer projects beginning in March 2026. This new website (oakleymodular.com) is dedicated to the Oakley modular projects, and will remain separate and distinct from Tony’s main site (oakleysound.com)…
Oakley Eurorack Projects
Oakley Sound Analogue Sequencer
The Oakley Sound Sequencer is a 50HP wide eurorack analogue sequencer with a maximum of eight steps and multistage loading capability. Each step can be selected to reset the sequence back to the start,…
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Classic VCA – Discrete core voltage controlled amplifier
The 6HP wide Oakley Classic VCA is a new version of one of my first Eurorack modules. This is a voltage controlled amplifier module inspired in part by a classic vintage design, the ARP4019…
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Dual VCO – Two classic sawtooth core oscillators
The 14HP wide Oakley Dual VCO, or DVCO, is two traditional sawtooth core voltage controlled oscillators in one module sharing a single common 1V/octave input. Each oscillator features a sawtooth (falling ramp) and variable…
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The Discrete Ladder Filter Module
The Oakley Discrete Ladder Filter (DLF) is my reworking of the classic 1960's low pass filter module. Inspired by the circuits of the 904A filter and CP3 mixer, the DLF combines them into one…
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MOSPhaser: Voltage Controlled Phaser Module
The 6HP wide Oakley Sound MOSPhaser is a six stage phaser (five variable all pass filters and one fixed all pass filter) that generates a classic sound. Partly based on a well loved 1970s…
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COTA – Voltage Controlled ‘Cascaded OTA’ Filter
This is a 10HP wide four pole multimode filter module capable of -24dB/octave low pass, -12dB/octave low pass and +/-6dB/octave bandpass outputs simultaneously. The filter core is based on four identical cascaded current controlled…
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HVM – Human Voice Module
The 8HP wide Oakley Sound Human Voice Module (HVM) is an all analogue audio signal modification unit that replicates some of the sounds made from a classic electronic keyboard first seen and heard in…
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Croglin – Voltage Controlled Dual Filter
The 10HP wide Oakley Croglin Voltage Controlled Filter (VCF) is based around two low noise 'Sallen-Key' filter circuits that operate either together or against each other. The cut off frequency of both filters, named…
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Journeyman – Classic Diode Ring Filter
This is a 6HP wide four pole dual mode filter module capable of either -12dB/octave low pass or -6dB/octave high pass responses. The Journeyman's unlinear quirky discrete circuitry gives it a unique sound of…
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SVF – Voltage Controlled State Variable Filter
The Oakley SVF is a 10HP wide two stage multimode filter module capable of high pass, low pass, band pass and notch output modes. All four outputs are available simultaneously. The module is a…
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Oakley Sound Multimix
The 6HP wide Oakley Sound Eurorack Multimix is highly useful mixer module that can be used to process both control voltages (CVs) and audio. It is based on the original 'Stooge' version of the…
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Envelope – A Looping ADSR module for Eurorack
The 6HP wide Oakley Envelope is an easy to use four stage envelope generator with switchable looping mode. The ADSR is operated by a traditional gate signal, but can also be triggered by slow…
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EPSU: Eurorack Power Supply Module
The issue 2.1 Oakley EPSU built with the linear option that uses a more traditional 78M05 to create the +5V rail. Note also the 0V bonding point and 0V connection to a 'grounding' 4mm…
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Euro Dizzy: Eurorack Power Distribution board
An earlier version of the issue 2 Euro Dizzy board. Newer issue 2 boards have green solder mask instead of red. This is a power distribution board supporting eight 16-way IDC headers and four…
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Voltage Controlled Low Frequency Oscillator
The suggested layout of the VC-LFO module in a 1U wide panel. This is a versatile yet easy to use voltage controlled low frequency oscillator module that can also be used as an audio…
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Dual-LFO
The Oakley Dual-LFO is a single width 5U high module that features two highly useful low frequency oscillators. This is an updated version of the low frequency oscillator from a classic Japanese vintage analogue…
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Slim VCO
The suggested panel designs for the SVCO-A (left) and SVCO-B (right) single width voltage controlled oscillators. Two compact well specified audio VCOs for MOTM and MU based modular synthesisers. The 'A' variant has a…
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The ‘One-of-three’ VCO
An excellent sounding and popular VCO (voltage controlled oscillator) module. The design was originally inspired by the classic sound of the Mini's VCOs with the central core of the oscillator being somewhat similar. However,…
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VCO Controller
1U wide suggested panel layout for those with Oakley CV/gate Bus fitted. Those without CV/gate bussing can simply use a different socket choice - perhaps foregoing the VCA CV OUT and SQR OUT for…
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The Transistor Superladder Variable Slope VCF
This is the 1U wide 'Filter Core' version of the Transistor Superladder. One would use this module in conjunction with external mixers for maximum control. The Transistor Superladder or TSL is a voltage controlled…
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Croglin – Voltage Controlled Dual Low Pass Filter
The panel design for the 1U wide 'filter-core' Croglin. The Oakley Croglin Voltage Controlled Filter is based around two unusual and quirky low pass filter circuits that operate either together or against each other.…
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HVM – Human Voice Module
The suggested panel design for the single width 1U wide MOTM format module. The Oakley Sound HVM is an all analogue audio signal modification device that replicates some of the sounds made from a…
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The Discrete Ladder Filter Module
The suggested panel design for the Filter Core 1U wide module. The Oakley discrete ladder filter (DLF) is my reworking of the classic 1960's low pass filter module using the circuits from the 904A…
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The Oakley Diode Superladder Variable Slope VCF
This is the 1U wide 'Filter Core' version of the Diode SuperLadder. One would normally use this module in conjunction with external mixers for maximum control. This latest version of the classic Oakley Superladder…
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Voltage Controlled State Variable Filter
The SVF in our 1U 'filter core' format. This is a two pole multimode filter capable of high pass, low pass, band pass and notch output modes. All four outputs are available simultaneously. This…
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The Journeyman Voltage Controlled Filter Module
The 1U format 'filter core' Journeyman filter. This offers the basic filter module without the extra CV and audio mixing that the full width 2U module provides. The completely unlinear response and discrete circuitry…
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The Voltage Controlled ADSR and VCA module
The suggested panel design for the 2U wide complete VC-ADSR module This is a dual purpose module in a 2U width panel. Not only does it feature a four stage envelope looping generator with…
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VRG – Versatile Ramp Generator
The Oakley Versatile Ramp Generator (VRG) is a single width 5U high module that can function as a voltage controlled variable symmetry oscillator, a traditional attack-decay envelope generator, a one shot transient generator with…
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Looping ADSR with integral VCA
This is a very popular dual purpose module. Not only does it feature a looping four stage envelope generator, but it also has a high quality VCA onboard. Two outputs are provided, one, labelled…
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The Oakley FourMix
A simple but effective four channel mixer for use with control voltages and audio. Each channel has an independent level control that goes from fully off to unity gain. Two outputs are provided. OUT…
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The Oakley Multimix
The suggested panel design for the MOTM format Multimix. A highly useful utility module. It's a four channel mixer with a twist. The first three inputs have each an independant level control. Each level…
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The Noise and Dual Filter module
The issue 4 Noise/Filter front panel The Oakley Noise and Dual Filter module is used to generate non pitched sounds such as wind, surf and other ethereal sounds. It can also be used as…
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The Oakley Router
The Oakley Router is a simple but useful module. The top section is two passive multiples. A multiple, or 'mult', is a number of sockets, in this case four, that are connected together in…
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Sample/Slew Generator
This compact single width module features a powerful sample and hold module with controllable correlation, a slew generator, a wide range clock oscillator and a dual output noise generator. It can be used to…
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The Envelope Follower and Gate Extractor (EFG)
The double width EFG-Deluxe (left) and the single width EFG (right) - both shown in the suggested standard finish MOTM format. An envelope follower takes an audio input and converts it into a control…
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The Oakley Sound MOSPhaser is a six stage phaser (five variable all pass filters and one fixed all pass filter) that generates a classic sound. Partly based on a well loved 1970s guitar effects…
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Discontinuity: Analogue Synthesizer Waveshaper, Wavesplicer and Wavefolder
Discontinuity - Waveshaper, Wavefolder, Clipper, Ring Modulator & Wavesplicer The Discontinuity is the updated version of an older Oakley module called the Wavefolder. It is a voltage controlled waveshaper module designed primarily for use…
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Flanger/Chorus
The Oakley Flanger & Chorus module is an analogue delay line capable of delaying audio signals from 0.5mS to 15mS. In conjunction with an external LFO module this unit can be used to produce…
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Equinoxe: Voltage Controlled Phaser Module
This is our hugely popular version of the classic four stage OTA based phaser. Wonderfully lush and smooth, it is similar in sound to the phaser used by Jean Michel Jarre on the Oxygene…
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Deep Equinoxe: Voltage Controlled Eight Stage Phaser Module
There are two suggested front panel designs. The one on the left is the original two switch variant, while the one on the right uses a single three position switch. This is an upgrade…
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Oakley Modular Synthesiser: Overdrive, Distortion and Harmonic Multiplier Module
Overdrive-II: Analogue Overdrive, Distortion and HarmonicMultiplier Module The Oakley Overdrive-II features two different waveform modifiers to produce a wide range of overdriven and distortion sounds. The first waveform modifier is a classic overdrive circuit…
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PSU2 – Power Supply Unit for DIY Synthesiser Systems
Constructional difficulty: Moderate if using a low voltage AC output mains adapter. A completed issue PSU2 board. This one is powered from an internal mains transformer so has the switch terminals linked out. The…
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Dizzy: Power Distribution board
The issue 4 Dizzy board. 1/4" (6.35mm) Faston blade terminals provide for easy and reliable connections to the master power supply. This is a MOTM/Oakley power distribution board supporting twelve 4-way 0.156" (3.96mm) MTA/Molex…
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MU Dizzy: Power Distribution board for MU modular systems
A completed MU Dizzy module with integral 5V regulator. The regulator IC has been mounted onto the metal panel to allow currents up to 250mA to be taken from the +5V rail. This is…
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The midiDAC Single Channel midi-CV Convertor
The midiDAC is a well specified single channel midi to analogue convertor. This project is a joint development between Oakley Sound and Trevor Page. The 5U high 2U wide panel layout for the MOTM…
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