Audio Interface
Audio Interface
Audio Interface

 

  • Type/ In&Out
  • Width/ 14HP
  • Power/ +110mA/-120mA
  • Depth/ 40mm

 
The ACL Audio Interface is a flexible High-End Solution to integrate a modular synth into a studio environment with a balanced audio signal flow. Apart from balancing and unbalancing audio signal, it also features a powerful headphone amp. The module is designed with extra attention to a linear, neutral sound with THD figures as low as possible.
 
 
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Discrete Core Ladder Filter VCF
Discrete Core Ladder Filter VCF
Discrete Core Ladder Filter VCF

 

  • Type/ Filter
  • Width/ 14HP
  • Power/ +mA/-mA
  • Depth/ 22mm

 
The ACL 24dB Disrete Core Ladder Filter VCF is classic transistor ladder design.
A fully discrete, low noise, low distortion audio path is used in the whole circuitry.
Some special features provides loads of possibilities as described in the text below.

The VCF ladder design consists of 4 stages, providing an buffered output for each of the 4 stages separately in order to
get a 6dB, 12dB, 18dB and 24dB/octave -sloped filter output individually.

The cutoff frequency of the VCF can be controlled manually using the knob named „CUTOFF“ and by 3 independent external control voltages, connected to the input jacks „1V/OCT“, „CV1“ and „CV2“, the latter two having attenuators.
The VCF´s resonance can be controlled manually and by an external CV.

When resonance is turned fully, up self oscillation will occur, enabling to use the VCF as a voltage controlled quadrature oscillator (a 90 degree shift occurs at every filter pole)
 
 
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Dual State Variable VCF
Dual State Variable VCF
Dual State Variable VCF

 

  • Type/ Filter
  • Width/ 26HP
  • Power/ +53mA/-50mA
  • Depth/ 22mm

 
In the category “dual multi-mode filter with normalizations and common control of both cutoffs” ACL present a State Variable filter with 12dB slope, individual outputs, variable filter routing as well as the variable notch balance known from the Oberheim SEM, blending over from low pass over notch to high pass.

The two filters have the same layout: each has an audio input with level control. Cutoff and resonance are set both manually and with CVs; the CV inputs feature polarizers for setting modulation intensity, For filter tracking there’s an input which tracks approximately 1V/octave.
Each filter has four individual outputs for different filter types; low pass, notch, high pass and band pass. A special feature is the possiblity to crossfade the notch from low pass to high pass, creating different timbres and. A shame that this parameter is not voltage controlable.

Indeed you can use the filters separately and individually but the Dual SVF offers a number of normalizations for simultaneous control of both filters. All audio inputs and CV inputs of filter A are pre-patched to the inputs of filter B. The cutoff frequencies of both sections can be manually controlled at the same time using the Dual Cutoff potentiometer.
The signal flow is determined by two switches; the upper switch PAR/SER selects whether the filters work parallely or in series. In latter mode the lower switch determines which output of filter A is routed to the input of B, either the bandpass or the notch (which alllows for selecting low and high pass).
 
 
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Envelope x3
Envelope x3
Envelope x3

 

  • Type/ Envelope
  • Width/ 21HP
  • Power/ +36mA/-23mA
  • Depth/ 22mm

 
The Envelope x3 gives you three ADSR-envelopes in one module. This envelope is inspired by the one of the System 100m which is very strong in creating percussive sounds.

Each of the three envelopes can be triggered via their own gate inpus. The inputs are normalised, therefore all three envelopes can also be triggered at once by one common trigger input.
Each envelope generator has a normal and inverted output, the range can be switched between short and long.

The module is made of precision components, as used in measuring instruments for instance, in order to keep the parameters exact and stable for a long time.
As flashly LEDs for visualisation were omitted the power consumption of the Triple Envelope Generatois quite low.
 
 
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Gate Mixer
Gate Mixer
Gate Mixer

 

  • Type/ Mixer
  • Width/ 12HP
  • Power/ +36mA/-23mA
  • Depth/ 22mm

 
The ACL Gate Mixer is a 4 channel Audio signal mixer, consisting two 2-in-1 mixers (1+2 ?& 3+4), whose outputs are summed together to the master output. All 4 channels can be switched ON/OFF via switches and/or gate or even CV signals.

Furthermore there is an AUX-input, which is routed unity gain (no attenuator) to the SUM. The logic of switching the signals on and off can be negated (inverted), meaning a high control signal could switch the signal on (gate=on) – or the opposite behaviour; a high control signal could switch the signal off (gate=mute).

So you can always switch the channels on and off using the switch, by just flipping the channel´s state (on or off). No disturbing clicks or glitches should be heard when switching an audio input signal on and off due to a fast “slew ramping” takes place in the circuit, controlling the amplitude of the signal when switched on and off.
Each Channel has a LED which is lighting up, when the channel is switched on.
 
 
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M/S Matrix
M/S Matrix
M/S Matrix

 

  • Type/ Mixer
  • Width/ 10HP
  • Power/ +16mA/-16mA
  • Depth/ 22mm

 
The ACL M/S Matrix module is able to deconstruct a conventional stereo signal, consists of a left and a right channel, into its mid and side signals. The other way round it can convert a M/S stereo signal to L/R stereo.
For that reason the module has four bi-directional sockets which carry the left, right, mid and side signals and are either inputs or outputs, depending on the mode of conversion.

When you play with the individual levels of left and right, classic panning happens. Something different happens with M/S: A change of the Side signal's level will change the stereo width while changing the Mid signal's amplitude will make the center more or less present but the side signal will remain unchanged!
For instance turning up the S signal from zero to max will continuously convert a center mono signal into a wide stereo signal.
The module offers individual level control for each stereo channel which can be controlled with potentiometers and voltages

Besides the aforementioned different compression of mid and side you might as well process sterophonic reverb and change the stereo width of the reverb tail.
 
 
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MiniMod CV Mix-Offset VCA black
MiniMod CV Mix-Offset VCA black
MiniMod CV Mix-Offset VCA black

 

  • Type/ Mixer
  • Width/ 10HP
  • Power/ +30mA/-12mA
  • Depth/ 26mm

 
The MiniMod CVMix-Offset-VCA is a compact 10hp wide Eurorack format module. It has been developed to offer a range of useful utilities for the MiniMod system and of course other Eurorack synthesisers..

It comprises a four channel polarising mixer, amplifier, inverter, a voltage source and a DC coupled VCA with switchable CV offset.

Uses include mixing together CV modulation sources, mixing an offset voltage with a CV source, converting a bipolar +/- 5V modulation into a unipolar 0 to +5V.
 
 
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MiniMod CV Mix-Offset VCA silver
MiniMod CV Mix-Offset VCA silver
MiniMod CV Mix-Offset VCA silver

 

  • Type/ Mixer
  • Width/ 10HP
  • Power/ +30mA/-12mA
  • Depth/ 26mm

 
The MiniMod CVMix-Offset-VCA is a compact 10hp wide Eurorack format module. It has been developed to offer a range of useful utilities for the MiniMod system and of course other Eurorack synthesisers..

It comprises a four channel polarising mixer, amplifier, inverter, a voltage source and a DC coupled VCA with switchable CV offset.

Uses include mixing together CV modulation sources, mixing an offset voltage with a CV source, converting a bipolar +/- 5V modulation into a unipolar 0 to +5V.
 
 
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MiniMod DH-ADSR black
MiniMod DH-ADSR black
MiniMod DH-ADSR black

 

  • Type/ Envelope
  • Width/ 10HP
  • Power/ +30mA/-12mA
  • Depth/ 26mm

 
The Complex Envelope Generator is based on one channel of the existing MiniMod Dual EG. In order to increase versatility, it has a Release control added to the envelope so that it is full ADSR but still with the characteristics of the Model D.
However, further additions were made: a pulse delay and pulse stretch circuit, along with a re-trigger facility (both of these can be switched out of circuit so that the envelope is a simple ADSR unit). The addition of pulse conditioning and retrigger makes it into an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, but with a full ADSR envelope too…
 
 
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MiniMod DH-ADSR silver
MiniMod DH-ADSR silver
MiniMod DH-ADSR silver

 

  • Type/ Envelope
  • Width/ 10HP
  • Power/ +30mA/-12mA
  • Depth/ 26mm

 
The Complex Envelope Generator is based on one channel of the existing MiniMod Dual EG. In order to increase versatility, it has a Release control added to the envelope so that it is full ADSR but still with the characteristics of the Model D.
However, further additions were made: a pulse delay and pulse stretch circuit, along with a re-trigger facility (both of these can be switched out of circuit so that the envelope is a simple ADSR unit). The addition of pulse conditioning and retrigger makes it into an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, but with a full ADSR envelope too…
 
 
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QLFO
QLFO
QLFO

 

  • Type/ LFO
  • Width/ 8HP
  • Power/ +28mA/-28mA
  • Depth/ 22mm

 
The QLFO is a quadrature sinewave LFO featuring voltage control of frequency. Due to a wider range of frequency and a 1V/octave input it can be used as a sinewave oscillator as well.

The AQA Elektrix Qudrature LFO’s rate is determined by the Rate potentiometer and the three position switch (slow, mid, fast). Two CV inputs allow for external control – one has a fixed characteristic of one volt per octave and the other is equipped with a polarizer for setting modulation intensity and polarity.
Four sine waves are available simultaneously, each is 90° phase shifted. To be correct you have to say a sine, a cosine and their inverted counterparts are generated.
 
 
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quadroPOL
quadroPOL
quadroPOL

 

  • Type/ Utility
  • Width/ 10HP
  • Power/ +45mA/-35mA
  • Depth/ 30mm

 
The quadroPOL is a multi-functional module with four identical channels. Each of them can individually work as a manual or voltage controlled attenuator and inverter, a ring modulator or a constant voltage source. It´s also possible to link two or more channels together to work as a voltage controllled polarizing mixer.
 
 
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uniCYCLE VCO
uniCYCLE VCO
uniCYCLE VCO

 

  • Type/ Oscillator
  • Width/ 10HP
  • Power/ +70mA/-60mA
  • Depth/ 45mm

 
The UniCYCLE painstakingly follows 1V/octave for over 5 octaves.

It simultaneously produces six wave forms, which include sawtooth, triangle, pulse and sine, but also unusual selections like “even” and “double sawtooth” (double frequnecy), which can both be modulated by the PWM controls. “Even” has only even overtones and can be transformed into a sine-like wave form. “double sawtooth” can be transformed into a triangular wave form.

The UniCYCLE is capable of soft and hard oscillator sync as well as exponential and linear FM.
 
 
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Variable Sync VCO
Variable Sync VCO
Variable Sync VCO

 

  • Type/ Oscillator
  • Width/ 16HP
  • Power/ +40mA/-35mA
  • Depth/ 22mm

 
The ACL Variable Sync VCO consists of one ramp core oscillator with several wave shaper subcircuits, all having that classical vintage tone, loved by a lot of musicians and soundsynthesists.
The VCO is capable of delivering that without sacrificing tracking precision and low temperature drift.
Available waveshapes are saw, inverted saw, triangle, sine and PW rectangle, which uses the saw wave from the waveshaper as a carrier for the PWM. It can be varied by CV and manually within a range from 0 percent to almost 100 percent.
The possibility to play VCO in low, middle and high modes, together with the 10 turn precision Tune pot results in a very convenient ”on the fly” way of tuning the module. It’s core can be frequency modulated exponentially from two inputs, both CV controlled. When fully open the input attenuators are calibrated for 1 V/Oct. There is one more input – for linear modulation with manual amount control, AC coupled and configured like differentiator. In this way it is sure no detuning caused by DC, will take place when modulation signal is presented at the FM Input, but only frequency modulation, centered around the already played tone.
Syncing the core to outside source makes a whole lot of difference, when there is the additional option to vary continuously by CV and manually the threshold of synchronization from no sync, soft sync and hard sync. This input is configured as attenuverter for even more flexibility. Note when the Treshold pot is fully CW there will be no sound output anymore. The reference wave source for the soft sync is the saw from the oscillator. Sync input itself reacts to every repeatable waveform with amplitude higher than 1,2 Vpp.
 
 
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VC Dual Delay
VC Dual Delay
VC Dual Delay

 

  • Type/ Effect
  • Width/ 21HP
  • Power/ +85mA/-40mA
  • Depth/ 22mm

 
The recently popular Princeton delay chip PT2399 is the heart of this delay as well yet this module houses two individual delay units with their own, open feedback loops, low- and high frequency cut in the feedback and voltae control of delay time.
Things get interesting by normalizations of delay A to B and the simple and intuitive routing of the delays and feedbacks.

The delay time is set with the Rate potentiometer and with a control voltage. The modulation input IN CV has a bi-polar attenuator (Rate CV). The sensitivity of the modulation input can be multiplied by ten with the NORM / x10 switch.

Feedback: in the, usually closed, feedback loop of each delay two filters are integrated for dampening the highs and lows of the echo. These LO CUT and HI CUT filters a have a slope of 6dB and do not feature voltage control.
The feedback path can be opened whend desired, for that task two outputs and one input are available: FLT FB OUT emits the filtered feedback signal while FB OUT carries the non-filtered signal. The feedback signal can now be processed and injected back to the delay via the FB IN socket. The feedback amount and polarity are set with the according bi-polar attenuator i.e. positive and negative feedbacks are possible.
 
 
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VC Panning Amplifier
VC Panning Amplifier
VC Panning Amplifier

 

  • Type/ Mixer
  • Width/ 14HP
  • Power/ +46mA/-42mA
  • Depth/ 22mm

 
The ACL VC Panning Amplifier is specially designed to process audio signals, dynamically positioning them in a stereo field. In case one processes mono signals, but still needs low distortion, low CV feed-trough, low noise voltage controlled attenuation and amplifcation, the unit can be also operated as two standalone VCAs.

The module has two exponential response VCAs with voltage and manually controlled gains, input level attenuators and overload indicators.
When no jack is connected to IN 2 and CV 2 inputs, they are normalized to IN 1 and CV 1 inputs respectively. Some of the possible confgurations with this arrangement allow the gain of both channels to be controlled together with one CV, while processing different audio signals, or both channels to be operated individually, if needed. The gain balance between both VCAs and hence the panorama position of a stereo signal is manually and voltage controllable. The common gain of the two channels is also manually adjustable with a single pot.
 
 
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