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Worng Electronics Acronym Eurorack Oscillator Module

WORNG Electronics

£395.00
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ACRONYM stands for

Analogue CoRe Oscillator New tYpe: Morphing.

It combines a solid-tracking triangle core analogue VCO with some

unique waveshaping circuits, and packages it all with a user-friendly

interface that allows precise control by hand or with CV.

The key parts of ACRONYM are:

- Triangle core VCO

- Waveshaping circuits

- Two-octave sub-oscillator

- Five-way voltage-controlled waveform morpher

- Audio outputs

VCO CORE:

The triangle VCO core features linear through-zero phase modulation

for clean and tuneful FM tones, and is the basis of all outputs from the

module. The core accurately tracks 8+ octaves, even while being

modulated, and includes hard sync. The Sync input detects a rising

edge and resets the core to its negative peak. The volt per octave input

is marked V/8 and is accurately calibrated in the factory.

Some may wonder why the Fine Tune control is large and the Coarse is

smaller, as these are often the other way round on modules from other

companies. This design choice was made as a larger control makes it

easier to make a finer adjustment, as it has a larger circumference than

a smaller control. This allows the Coarse tune to quickly get you in the

general range of where you want your frequency to be, and then use

the Fine tune for accurate final control. This is particularly effective for

Phase Modulation, where accurate frequency ratios between the VCO

and modulation source are important.

WAVESHAPING:

Waveshaping creates additional Sine and Sawtooth waves from the

Triangle core, and a Pulse to drive the sub-oscillator circuit. The Sine is

then fed through an additional Wavefolder circuit to create rich and

complex harmonic overtones. Note that the Wave Morph CV is used to

subtly modulate the Bias of the Wavefolder circuit to create interesting

shifting fold behaviour as the folded wave is blended into the Saw.

SUBOSCILLATORS:

The sub-oscillators are specifically shaped to create a hybrid

square/saw shape which has a more characterful chewy sound than a

typical perfect square shape. This also allows them to be used as

modulation sources which give a wider range of voltage rather than

just the on/off of a square wave. The triangular frequency indicator on

the panel is not driven directly by the core, but by the -2 oct

suboscillator. This makes it easier to detect frequency changes, as well

as the distinctive behaviour of the suboscillators while the core is being

phase modulated.

Because the suboscillators run from a comparator which is triggered by

a level detector in the VCO core, when the core is being phase

modulated through zero it may cross this threshold multiple times as

the core rapidly reverses direction, leading to periodic higher

frequency outputs from the suboscillators. This more complex phase

modulation doesn’t exactly follow the core which is what makes it

interesting, but can seem chaotic at times. You’ll find that using a

modulation source which is tuned to a multiple of the core frequency

will tame this behaviour somewhat if needed, and using sync between

two even moreso.

WAVEFORM MORPHER:

This output morphs between the Triangle, Square, Saw and Folded Sine

waves with the Wave control or Wave CV input. Additionally, a

combination of the -1 octave and -2 octave sub oscillator waves can be

mixed into the Wave output with the Sub Lvl control. This allows you to

get a complex mixture of waveforms as the basis of your synth voice

without the use of external mixers, as well as use voltage controlled

morphing to generate more complex waveforms.

The Morph CV input is designed to accept a voltage from -5V to +5V

and is attenuverting so it can be swept fully with a typical Eurorack

audio signal. Of course this means if you have a stronger signal, for

example a +10V envelope, turning the input attenuvertor to 50% will

give the full range of modulation. Because it’s a 100% analogue circuit

the input can be pushed outside those bounds and instead of clipping

at the edges it will continue giving interesting outputs as it’s pushed.

AUDIO OUTPUTS:

The Triangle and Sine waves, as well as the one and two octave

Sub-oscillator outputs, are available as outputs on the bottom of the

module. The final output is the Waveform morpher output, marked

Wave on the panel.

The design choice was made to provide the simpler, less harmonically

rich waveforms on their own outputs both so they could be used as

modulation sources and as a clean output to create more complex

waves via phase modulation. The more complex and harmonically rich

waveforms are available via the Morpher on the Wave output.

Product Overview

ACRONYM stands for

Analogue CoRe Oscillator New tYpe: Morphing.

It combines a solid-tracking triangle core analogue VCO with some

unique waveshaping circuits, and packages it all with a user-friendly

interface that allows precise control by hand or with CV.

The key parts of ACRONYM are:

- Triangle core VCO

- Waveshaping circuits

- Two-octave sub-oscillator

- Five-way voltage-controlled waveform morpher

- Audio outputs

VCO CORE:

The triangle VCO core features linear through-zero phase modulation

for clean and tuneful FM tones, and is the basis of all outputs from the

module. The core accurately tracks 8+ octaves, even while being

modulated, and includes hard sync. The Sync input detects a rising

edge and resets the core to its negative peak. The volt per octave input

is marked V/8 and is accurately calibrated in the factory.

Some may wonder why the Fine Tune control is large and the Coarse is

smaller, as these are often the other way round on modules from other

companies. This design choice was made as a larger control makes it

easier to make a finer adjustment, as it has a larger circumference than

a smaller control. This allows the Coarse tune to quickly get you in the

general range of where you want your frequency to be, and then use

the Fine tune for accurate final control. This is particularly effective for

Phase Modulation, where accurate frequency ratios between the VCO

and modulation source are important.

WAVESHAPING:

Waveshaping creates additional Sine and Sawtooth waves from the

Triangle core, and a Pulse to drive the sub-oscillator circuit. The Sine is

then fed through an additional Wavefolder circuit to create rich and

complex harmonic overtones. Note that the Wave Morph CV is used to

subtly modulate the Bias of the Wavefolder circuit to create interesting

shifting fold behaviour as the folded wave is blended into the Saw.

SUBOSCILLATORS:

The sub-oscillators are specifically shaped to create a hybrid

square/saw shape which has a more characterful chewy sound than a

typical perfect square shape. This also allows them to be used as

modulation sources which give a wider range of voltage rather than

just the on/off of a square wave. The triangular frequency indicator on

the panel is not driven directly by the core, but by the -2 oct

suboscillator. This makes it easier to detect frequency changes, as well

as the distinctive behaviour of the suboscillators while the core is being

phase modulated.

Because the suboscillators run from a comparator which is triggered by

a level detector in the VCO core, when the core is being phase

modulated through zero it may cross this threshold multiple times as

the core rapidly reverses direction, leading to periodic higher

frequency outputs from the suboscillators. This more complex phase

modulation doesn’t exactly follow the core which is what makes it

interesting, but can seem chaotic at times. You’ll find that using a

modulation source which is tuned to a multiple of the core frequency

will tame this behaviour somewhat if needed, and using sync between

two even moreso.

WAVEFORM MORPHER:

This output morphs between the Triangle, Square, Saw and Folded Sine

waves with the Wave control or Wave CV input. Additionally, a

combination of the -1 octave and -2 octave sub oscillator waves can be

mixed into the Wave output with the Sub Lvl control. This allows you to

get a complex mixture of waveforms as the basis of your synth voice

without the use of external mixers, as well as use voltage controlled

morphing to generate more complex waveforms.

The Morph CV input is designed to accept a voltage from -5V to +5V

and is attenuverting so it can be swept fully with a typical Eurorack

audio signal. Of course this means if you have a stronger signal, for

example a +10V envelope, turning the input attenuvertor to 50% will

give the full range of modulation. Because it’s a 100% analogue circuit

the input can be pushed outside those bounds and instead of clipping

at the edges it will continue giving interesting outputs as it’s pushed.

AUDIO OUTPUTS:

The Triangle and Sine waves, as well as the one and two octave

Sub-oscillator outputs, are available as outputs on the bottom of the

module. The final output is the Waveform morpher output, marked

Wave on the panel.

The design choice was made to provide the simpler, less harmonically

rich waveforms on their own outputs both so they could be used as

modulation sources and as a clean output to create more complex

waves via phase modulation. The more complex and harmonically rich

waveforms are available via the Morpher on the Wave output.