GrainFlux 2.0 is now available!

The new 2.0 update for GrainFlux, our granular / hybrid Max for Live synthesizer, is now available and it includes new features, enhancements and bug fixes!


Check out the overview video for this new update:

Our goal for this new update was to take GrainFlux to the next level and add new features (such as the new modes, Center parameter, Multi-Stage envelope, Filter FM, etc) that would allow the user to create even more interesting timbres and sounds.

Here's a list of what's new in GrainFlux 2.0:

6 new modes: Regular, Inverted, Alternate, Ringmod, Min/Max and Max/Min.
     ↳ Regular: Wave 1 and Wave 2 are mixed together normally.
     ↳ Inverted: Wave 1 and 2 are mixed together while Wave 2’s phase is flipped 180º.
     ↳ Alternate: Alternates between Wave 1 and Wave 2.
     ↳ RingMod: Wave 1 is multiplied by Wave 2.
     ↳ Max/Min: positive part from Wave 1 + negative part from Wave 2.
     ↳ Min/Max: negative part of Wave 1 + positive part from Wave 2.
New Center parameter: modifies how the modes operate in different ways depending on the mode.
Added a new Multi-Env mode to Envelopes 1 and 2. The user has the option to select which mode he/she would like for each of the envelopes independently (ADSR or Multi-Env).
New post-VCA effect: Karplus. Karplus uses the a very short delay line that can be used to  add subtle reflections or a longer metallic “tail” to the sound.
Added enhancements to LFO: new Phase, Reset, and Shape controls.
• Re-designed Filter modulation engine to be more flexible and precise.
Added Filter FM with selectable modulation source (Bass Oscillator or Grain Wave).
• Added MIDI Velocity as a modulation source for the Filter’s Cutoff.
• Fixed the range and scale of the Bass Boost and Grain Wave knobs to work in dB (instead of linear gain).
• Changed the scale of all Modulation knobs as well as the Pre-Drive and Feedback knobs to 0-100%.

As usual, existing GrainFlux customers will receive the new 2.0 update for free via email (keep an eye on your inboxes!).

GrainFlux is available for U$14.99 at

Until next time!



New Beats Pack, CV Toolkit 2.1 and Complete Bundle

Hi everybody!
Today we'd like to announce 3 great news related to CV Toolkit 2: the new Beats pack, the new 2.1 update, and the CV Toolkit 2 – Complete Bundle.

Beats Pack

While CV Toolkit already includes many different sources of modulation, it only ever had very few virtual modules that were focused on creating gate / trigger sequences / rhythms therefore we decided to create the Beats pack.
The new Beats pack is a brand new module pack for CV Toolkit 2 and it features 5 modules : Binary Sequencer, Clock Quartet, Gate Sequencer, Sequential Rhythms and VC Random Gates.

Check out the overview video:

  • Binary Sequencer uses binary representations of the latin letters to create 8-step gate sequences. Each letter will generate a different sequence / pattern which can also be rotated and flipped via the panel controls and CV inputs. 
  • Clock Quartet uses 4 different clock dividers combined using OR logic (inspired by the Tiptop Audio Trigger Riot module) to create interesting sequences. Each of these clock dividers can be set to different rate, time shift, pulse-width and probability.
  • Gate Sequencer is a simple and easy to use sequencer with separate sequencing layers for probability and pulse-width per step. The length of the sequence can be set from 4 to 32 steps.
  • Sequencial Rhythms is a 4-stage switcher that can be sequenced to create interesting gate patterns. Each of the 4 stages include a clock divider that can be set to a specific rate / clock division. The built-in sequencer can be clocked internally, externally (via the Gate Bus), or controlled directly via the module's CV input (CV Mode) and can be set to 3 different modes: FWD (Forward), BWD (Backwards) or RND (Random). 
  • The VC Random Gates generates musically quantized random gates. With Complexity at 0%, the module will have a 70% probability of generating quarter notes. As you increate the Complexity amount, the module reduces the probability of generating quarter notes and increases the probability of creating shorter notes (1/6, 1/8, 1/12, 1/16, 1/32). 

The modules available in the new Beats module pack.

The new Beats Pack is available for U$ 9.99 at

CV Toolkit 2.1 Update

The new 2.1 update for CV Toolkit is now available and it fixes some bugs related to the Expert Sleepers ESX-4CV/ESX-8CV compatibility, other bugs we've found in some of the virtual modules, and enhances some of the features related to the CV to MIDI CC converters.

Many users have reported problems when using CV Toolkit with the Expert Sleepers ESX-4CV and ESX-8CV modules. After review our implementation of the Expert Sleepers encoders, we believe we found what was causing the problems. During the development of 2.1, we sent beta versions to some of these users and we were happy to hear that the problem got fixed without any (reported or noticed) backslash. 
In order to ensure better compatiblity, we had to change some of the details related to how the setup works so we ask users to double check the manual for more info.

The 2.1 update also adds the option of the changing CV Toolkit's MIDI output channel (available in MIDI Settings). This new setting makes CV Toolkit compatible with other MIDI to CV converters such as the Mutable Instruments CV Pal (which requires MIDI CC signals to be sent to channel #6).
While converting CV to MIDI CC and back to CV does degrade the signal in some ways, we believe that having that as a option can be useful and fun.
If a user had, for example, an Expert Sleepers ES-3 and a Mutable Instruments CV Pal, he/she'd be able to send out 12 simultaneous output signals from CV Toolkit to his synthesizer: 2 continuous signals (such as LFOs and S&H) and 2 gate signals (Gate Bus 1 and 2 for example) from the CV Pal (using CV Toolkit's CV to MIDI CC converters and CV Pal's Channel 6) and 8 other signals from the ES-3.
We see this more as a fun added bonus than a main feature.

If you'd like to know more about this new update, check out CV Toolkit's changelog. This new update is free for all existing customers and will be available via email

CV Toolkit 2 – Complete Bundle

While we believe that the new module packs are the best for users to expand CV Toolkit's functionality and help us continue to develop and work on the application, we wanted to offer a easy all-in solution.

The new CV Toolkit 2 – Complete Bundle is an easy way for new customers to get everything that is available for CV Toolkit without having to get everything separately. Since we didn't want to be unfair to our existing customers, we decided that the only benefit of buying the bundle would be that new customers will get the VBrazil LFO for free (which was also offered for free for all customers at first but is now paid).
We also chose not to give any further discounts because we try our best to price CV Toolkit as reasonable as possible.
We believe this will be fair and simple enough for everybody and will let new customers choose to either start with just the basic set (CV Toolkit by itself) or go all-in and get everything at once.

The CV Toolkit 2 – Complete Bundle (which includes the CV Toolkit 2 software and the Deluxe, VBrazil LFO, and the new Beats packs) is available for U$39.99 and it's also available at

If you'd like to keep up with our latest projects, follow us on Twitter (@SpektroAudio) and on Facebook (

Until next time!

Sonic Mayhem – Doomsday Producers Edition

Hi everybody!

We're extremely proud to finally announce that our first artist collaboration is now available: Sonic Mayhem's Doomsday  – Producers Edition.
Doomsday is Sonic Mayhem's debut album and the Producers Edition adds many useful tools for composers, sound designers and produces.

Check out the overview video:

During the creation of Doomsday, we worked together with Sascha Dikiciyan aka Sonic Mayhem to create an exclusive Kontakt library and 2 brand new Max for Live devices for the Producers Edition.

Kontakt Library

The Kontakt library includes drums, bass and lead instruments which were carefully sampled from Sonic Mayhem's own setup. Most of these instruments were created using his incredible Eurorack modular synthesizer.
All the Kontakt patches included in the Producers Edition feature a special interface which lets the user fine tune the sound to their own needs.


We also worked with Sascha to create two exclusive Max for Live devices for Doomsday: the OmegaSEQ and the AlphaDTR.


The OmegaSEQ is an 8-step sequencer and it let's the user record 8 notes using any MIDI controller. 
When set to Play mode the user will be able to play the original recorded sequence by playing the note C3. All the other notes will play and transpose the sequence according to the note interval between the note played and C3. In other words, D3 will transpose by 2 semitone, C4 will transpose by 12 semitones and so on.
OmegaSEQ also includes 2 very interesting features: a velocity sequencer and the Tension knob.
The velocity sequencer offers an easy and quick way to edit the MIDI velocity of all the 8 steps. It also features a smart random button which creates different rhythmic sequences.
The Tension knob is useful for creating build-ups without having to automate the internal parameters of your synthesizers. It works by increasing the velocity and gate length of all the steps while decreasing the swing amount. 


The AlphaDTR is an audio effect focused on distortion. It uses a combination of a distortion circuit (based on chebyshev polynomials) and a bit-crusher to distort and destroy everything your send to it, Doomsday style.
While AlphaDTR's main interface consists of only 3 easy-to-use parameters, the user also has the option to open the advanced settings for more granular control over each parameters.

Both Max for Live devices and the Kontakt library were created exclusively for Doomsday and were created with the same care as all our other products.
We're extremely proud to be part of this amazing project and to have it as our first ever artist collaboration.

The Doomsday Producers Edition is available exclusively at

Introducing the new CV Toolkit 2.0

We're extremely excited to announce that CV Toolkit 2.0 is now available! 
The new 2.0 version is a complete re-write and re-design of our most popular application to date and we worked extremely hard to make it as awesome as possible.

Check out the overview video below:

First of all, we'd like to explain why we decided to make a new major version and re-design the entire interface:
While developing the 1.x versions, we noticed that we couldn't implement many of the feature requests we were receiving from our customers because of the way the first versions were designed. Everything in 1.x was "hard-wired" so it was really complicated to implement completely new features.
We also noticed that 1.x had many inconsistencies that we'd like to get rid of (both in terms of UX and UI). 

In order to properly address many of these issues, we decided to start from scratch and re-write everything from the ground up. We planned and designed the entire app to make it work in a true modular fashion. 
Our goal was not only to create frameworks in which we could further expand in the future but also to make CV Toolkit more powerful and flexible while still maintaining it's clean design and great user experience.
We worked hard to find the best way to keep CV Toolkit simple enough for beginners but incredibly deep for more advanced users.

Here's what's new in CV Toolkit 2.0:

  • Completely new design. 
  • New slot system: you can now load any module to any of the slots and load multiple instances of the same module to different slots. All the slots available in CV Toolkit now work exactly the same and share the same characteristics.
  • Module Packs: further expand the functionality of CV Toolkit by purchasing additional module packs.
  • New Notes module: we combined the old MIDI to CV and Quantizer modules into a single module. 
  • Updates modules: all modules are now capable of running at audio rate.
  • New Routing Matrix layers (Output, Main and Control).
  • Utility Rack: 4 oscilloscopes + 4 CV to MIDI CC converters.
  • Internal Pitch and Gate Buses.
  • 3 Voicing Modes: monophonic, polyphonic and paraphonic.
  • New Layouts feature: store and recall different layouts. Each layout remembers which module you loaded into the 12 slots as well as the Gate and Pitch bus settings for the individual modules.
  • Support for the brand new littleBits USB i/o module.
  • New scale editor: you can now use any of the pre-existing scales available in CV Toolkit or edit / create your own.

With these amazing new features, you can now use CV Toolkit to create anything from simple sequenced patches to more elaborate polyphonic patches (up to four voices).

CV Toolkit 2.0 ships with a Factory Pack containing 14 modules: AD Envelope, Clock Generator, Comparator, Delay, Envelope, LFO, Morphing VCO, Notes, PWM Clock, S&H, Scangraph, Sequencer, Shaper, and Slew.
If you'd like to further expand CV Toolkit, you can buy the Deluxe Pack for U$9,99 in order to get 9 more modules (Logic, Matrix Sequencer, MIDI Control, Trigger Burst, VC Switch and VCA).
We're already working on even more module packs that will be available very soon.

We're also proud to announce that we've partnered with littleBits and Korg to make CV Toolkit compatible with their new littleBits USB i/o module. This means littleBits users can now use CV Toolkit together with their Synth Kits to make some amazing synth patches!
Check out the overview we made for the littleBits integration available at
More videos focused on this new integration will be available soon!

Due to major changes in this new version, some features such as the Preset Manager and Lemur support had to be removed. We do plan on bringing them back in the future. 

Since CV Toolkit 2.0 is a complete re-design and this is the first time we're doing paid upgrades, we decided to try something different:
Instead of having to pay for the new version, existing customers will get CV Toolkit 2.0 and all of it's new features for free. 
Because some of the modules that used to be included in 1.3 are now part of the Deluxe Pack (Biased Switcher, Shift Register and Euclidean Sequence) , existing customers will have to purchase the Deluxe Pack to regain access to those modules.
So, in other words, if you've purchased CV Toolkit 1.x, you'll get 2.0, all the new features (voicing modes, utility rack, new slot system, internal CV buses, etc) and most of the modules that used to be available in 1.3. 
If you decide to get a "full" upgrade, you can buy the Deluxe pack to re-gain access to those modules + 6 new modules and you'll continue to support the development of CV Toolkit.
Keep in mind that you're not forced to get the Deluxe Pack and you're also free to continue to use CV Toolkit 1.x (both versions can co-exist in your computer).
If you've bought CV Toolkit after March 1st, get in touch with us to receive a free copy of the Deluxe Pack.

We hope you enjoy this new version as much as we do!

CV Toolkit 2.0 is available for U$19.99 and the new Deluxe Pack is available for U$9.99.
They're both available at

As always, feel free to follow us on Twitter (@SpektroAudio) and on Facebook ( to get the latest news about our products and projects.

Until next time!

CV Toolkit - Standalone Version 1.3 is now available!

The new 1.3 update for CV Toolkit - Standalone Version is now available!

This update includes five new modules, support for the Expert Sleepers ES-4, ES-40, ESX-4CV, and ESX-8CV modules, a new pitch detection algorithm, and various improvements and bug fixes.

Check out the overview video:

New modules available in 1.3:

- Shaper: a 4 in 1 module that works as a wavefolder, a rectifier (full and half), an attenuverter and as an offset generator.

- Delay: Delay module capable of delaying any incoming signals by up to 4ms. The delay time can be either set in ms or synced to the BPM.

- Shift Register - 8bit analog-style shift register. Great for creating random sequences that slowly change over time.
- PMW Clock - A clock module with pulse-width modulation.

- Euclidean Sequencer -  Sequencer that generates rhythmic trigger patterns using an euclidean algorithm. 

The new pitch detection algorithm included in the MIDI to CV module lets you calibrate your oscillators which much more precision. According to our tests, CV Toolkit should now be able to calibrate VCOs faster and with a precision of +/- 2 cents. This new algorithm also lets you calibrate your oscillators using any of the 4 basic waveforms (sine, square, triangle and sawtooth).

This new update includes support for the Expert Sleepers ES-4, ES-40, ESX-4CV and ESX-8CV modules. The setup process is extremely easy: you only need to select what kind of setup you're running (ES-4 only, ES-4 + ESX-4CV, ES-40 + 2xESX-4CV, or ES-40 + ESX-8CV).
Although we got success results from our tests, the support for these modules is still experimental and it might be subjected to bugs. Our plan is to improve the support for these modules in future updates.

Last but not least, we also added fixes related to MIDI Clock, MIDI Pitch Bend and the Smux encoder.

The new 1.3 update is free for all CV Toolkit - Standalone Version customers so, if you’ve already bought a copy, check your email inbox for a download link.

CV Toolkit - Standalone Version is available for U$19,99 at

If you'd like to keep up with our latest news, follow us on Twitter (@SpektroAudio) or sign up for our newsletter.

Until next time!

Our Highlights from 2014

2014 was a great year for Spektro Audio. We worked on some great projects and we received a lot of support from our costumers, audio / music related websites and professionals from all over the world.
In this blog post, we'd like to highlight some great releases and achievements from 2014:

CV Toolkit - Standalone Version

The first version of CV Toolkit - Standalone Version was released in Janurary and it was greatly received by the modular synth community. CV Toolkit - Standalone Version 1.0 was reviewed by Resident Advisor and it received a 4/5 score. 
Since the first release, our goal for CV Toolkit has been to offer an incedibly flexible, easy to use and affordable solution.
Throughout the year, we released the 1.1 update that added important features such as VCO Calibration and a CV Quantizer, and the 1.2 update that introduced the new Virtual Slot System and four new virtual modules. 

Interface changes from the first 1.0 release to the latest 1.2 update.

Interface changes from the first 1.0 release to the latest 1.2 update.

Many professionals in the audio / music community such as Richard Devine, Sonic Mayhem, Cyrus Rex, Celldweller, Brent Daniels and many others have shown their support for CV Toolkit.
Our plan for 2015 is to continue to improve and expand CV Toolkit and even add support to other products (more about that in the near future!).


GrainFlux & Komplex 1.1 – Max for Live Synthesizers

This year we also released an amazing new Max for Live synthesizers called GrainFlux and a new 1.1 update for Komplex.

Screen Shot 2014-10-06 at 10.07.55 AM.png

GrainFlux is a monophonic virtual synthesizer that combines different synthesis techniques such as granular, wavetable, and subtractive synthesis to create unique and distinctive sounds. It uses audio samples to create different waveforms which can be morphed and modulated.
If you'd like to know more about GrainFlux, visit and check out the audio demos and video overview.

We also released a new 1.1 update for Komplex, our FM-based Max for Live synth. The 1.1 update added polyphony, adjustable envelope curves and many other minor enhancements.

For more information about Komplex 1.1, visit

Free Projects

In 2014, we decided to give back to the community by offering free projects such as the Wired Bass instrument pack for Ableton (which was featured on Create Digital Music and has had more than 5.000 downloads) and the Spektro PS-8, a free MaxforLive sequencer for the Ableton Push. 


We'd like to thank everybody for their continuous support and assure you that we'll continue to work hard to offer great new products and updates during 2015.

If you'd like to keep up with our latest announcements, follow us on Twitter (@SpektroAudio) and on Instagram (@SpektroAudio as well).

Until next time!

GrainFlux is now available!

Hello everybody!

We're proud to announce that GrainFlux, our latest MaxforLive synthesizer, is now available!

GrainFlux is a monophonic MaxforLive synthesizer that combines different synthesis techniques such as granular, wavetable, and subtractive to create unique and distinctive sounds. It works by using audio samples to create two different waveforms which can be morphed and modulated. 

While you can use any of your own samples, GrainFlux ships with 40 high-quality samples created using a Eurorack modular synthesizer to get you started. These samples were designed to give you a variety of different timbres and textures.

Check out the GrainFlux overview video below:

What sets GrainFlux apart from regular granular synthesizers is that it uses 2 separate and different grains which can be controlled independently. We developed some great and unique features such as the Tilt control, that lets you simultaneously change the grain size of the two waveforms in opposite directions. 

Since GrainFlux uses samples to create these waveforms, you can easily get completely different timbres and sounds by simply loading a different sample.

Our goal when designing this synth was to mix different synthesis ideas in a way that could provide powerful results while still being easy and fun to use. Everything in GrainFlux, from the default settings to the way modulation works, was carefully thought out so you can get very interesting timbres even from the most basic patches.

The interface was designed to make artists feel comfortable to experiment and play around without making them feel overwhelmed by too many controls and settings.

We also focused on providing a great and fast workflow. For example, when you drag an audio sample onto the Audio File drop-box, GrainFlux automatically updates the Folder drop-down menu to display all of the other audio files available in that same folder, so you can quickly try different samples.

GrainFlux is available for U$14.99 at

If you'd like to keep up with our latest news, follow us on Twitter (@SpektroAudio) or sign up for our newsletter.

Until next time!

CV Toolkit - Standalone Version 1.2 is now available!

Hello everybody!

We’re extremely excited to announce that the 1.2 update for CV Toolkit - Standalone Version is out!
This update fixes most of the issues we had with previous versions, brings many new features and set’s the path for the future of CV Toolkit.

Here’s what’s new in CV Toolkit - Standalone Version 1.2:


- Introducing the new Virtual Slot System: We wanted to add more virtual modules to CV Toolkit without having to make the interface bigger. The solution we came up with is the new Virtual Slot System (V.S.S). 
The idea behind VSS is to make the user interface work like a real modular synth case: although the size of the case is fixed, you can swap the modules inside the slots at any time and configure it to best suite your need. Now you can, for example, swap the Envelope module for a Clock Generator. 
In order to change the modules inside the slots, press the M key or click on the Modules button. If the slot contains multiple modules, a drop-down menu will be displayed for you to select which module you’d like to load inside that specific slot. If you want to, you can also use the preset manager to save custom configuration for future use.
V.S.S. will not only let us add new modules in the future but will also let you customize and adapt CV Toolkit to your own needs.

In the 1.2 update, we’re introducing 4 new modules:

  • CV Recorder (Slot #8) - Record the output of any other virtual module and play it back using Vari-Speed (-10x to 10x).
  • Comparator (Slot #8) -  Performs a bipolar 1-bit quantization to an incoming signal.
  • Morphing VCO (Slot #10) - A digital oscillator that can be used as sub oscillator, a modulator for FM  / ring-mod patches or as an audio-rate modulation.
  • Clock Generator (Slot #11) - Generate clock signals (gate or trigger) at different rates.

- Significant CPU usage optimization.
- CV Quantizer is now more reliable and contains 13 scales: Chromatic, Major, Minor, Harmonic Minor, Melodic Minor, Blues, Dorian, Lydian, Locrian, Major Pentatonic, Minor Pentatonic, Arabic and Augmented.  
- MIDI Notes Out - You can now send the output of the CV Quantizer module as MIDI notes to the selected MIDI output port. (Useful for layering sounds using other analog synths or virtual instruments). 
- Added a width control for the Step Sequencer Gate / Clock output (Available in the Options window)
- Added curve adjustment for AD1 and AD2 (Logarithmic →  Linear → Exponential)
- Added Pitch Bend support (with adjustable range to up to +/- 12 semitones)
- Improved voice handling
- Improved sync for the S&H module
- The Routing Matrix guidelines now have different colors for virtual modules (green) and analog outputs (blue).
- Lemur template updated to include new virtual modules.
- Minor design changes 

If you'd like to see these new features in action, check out the 1.2 Update Overview video:

The new 1.2 update is free for all CV Toolkit - Standalone Version costumers so, if you’ve already bought a copy, check your email inbox for a download link.

CV Toolkit - Standalone Version is available for U$19,99 at

If you'd like to keep up with our latest news, follow us on Twitter (@SpektroAudio) or sign up for our newsletter.

Until next time!

Wired Bass - Free Ableton Live Instrument Pack


Hello everybody!

While beta testing some of the new features of the upcoming 1.2 update for CV Toolkit – Standalone Version, we thought it'd be a great idea to work on a little gift for all you modular ehnthusiastics out there: a free Ableton Live instruments pack.

This instrument pack contains 10 multi-sampled bass patches for Ableton Live's Sampler instrument. These patches were created using a Eurorack modular synthesizer and CV Toolkit – Standalone Version.

We tried to come up with analog bass sounds that can work great in many different music genres by using variety of different oscillators, filters and synthesis techniques. 



All samples were recorded through an Universal Audio Apollo interface at 24 bits, 48 kHz.

If you'd like to get updates about our upcoming projects,  follow us on Twitter (@SpektroAudio) or subscribe to our newsletter (don't worry, we hate Spam as much as you do). 

Until next time!

Introducing Spektro DRG - Dual Rhythm Generator

Hi everybody!

We're thrilled to announce that Spektro DRG, our new product, is now available!

DRG or Dual Rhythm Generator is a Max for Live device capable of generating clocks and rhythms that can be used with analog synthesizers and drum machines via control voltage. It's a great solution for syncing your analog / modular synthesizers to Ableton Live.
Like all our cv-related products, DRG also requires an audio interface with DC-coupled outputs or an Expert Sleepers module.

Here's the promo video:

While testing the beta versions, we realized that DRG could be used in many different ways such as for clocking analog sequencers, sequencing drum modules, triggering envelope generators and clocking time-based function generators (such as the 4ms Pingable Envelope Generator and the Mutable Instruments Tides). 

We worked hard to make DRG flexible enough to be used in different situations. The workflow was thought out to work great both in the studio and in live concerts. Everything on the front panel, from the simple layout to the LEDs colors, was design to give you instant feedback of whats going on. Features such as the MIDI Controlled Presets let's you add variation to your track and change the settings using either MIDI clips or any MIDI controller.

Here's an overview / tutorial video that demonstrates the most important features:

The Spektro DRG device is available for U$9.99

If you'd like to know more about DRG, visit

Until next time!

What's coming in the Komplex 1.1 update!

Hey everybody!

After releasing the CV Toolkit 1.1 update, we decided to work on an update to one of our most popular MaxforLive devices, Komplex.

Komplex was released back in October of 2013 as a monophonic synthesizer based on the Buchla 261e module. After receiving a lot of feedback from our customers, we decided that, for this 1.1 update, we wanted to work on improvements rather than on new features.


Here's what's coming:

• Polyphony – Komplex can now play up to 6 voices! You can now use Komplex to create some FM keys ;)

• Improvements to the Wave Morph section – morphing between the 3 waveforms sounds a lot smoother.

• Improvements to the 3 ADSR E.G.s – adjustable curves (Log - Lin - Expo) and equivalent ranges to all 3 E.G.s.

• Improved FM section  - we've fixed some issued related to the FM section and the modulating wave's phase.

• Minor design improvements to improve usability.

• New preset bank.

Although we didn't add many new features to this update, we re-designed the core of this device in order to greatly improve the overall sound of the synth.

The Komplex 1.1 update will be a free update and we're planning on releasing it very soon. 

If you'd like to know more about this update, follow us on Twitter (@SpektroAudio).

Until next time!

CV Toolkit – Standalone Version 1.1 update is out!

Hey everybody!

We're super excited to announce that the 1.1 update for CV Toolkit – Standalone Version has been released!

The update includes two new virtual modules (MIDI to CV and CV Quantizer), native Smux support (Mac only), and many different improvements to the "Scangraph", "Envelope" and "Step Sequencer" virtual modules. If you'd like to know more about the many new features and improvements, read our previous blog post or check out the full changelog.

The major new feature in this update is the new "MIDI to CV" virtual module that lets you calibrate your VCOs and play them in tune using MIDI or the new "CV Quantizer" in conjunction with any of the other virtual modules. This was one of the most requested features that we received when we first released CV Toolkit and it's now available!
Please keep in mind that this is a new feature so we'll be improving it during future updates.

Check out these 3 new videos that demonstrate the new features available in the 1.1 update:

We worked hard to add as many new features as we could while maintaining the overall workflow simplicity.

If you've already bought CV Toolkit – Standalone Version, you'll receive the download link for the 1.1 update via email.

We hope you have fun with this new update and, as always, feel free to get in touch with us if you need help or have any new ideas for future updates!

Until next time!

CV Toolkit – Biased Switcher Explained

Today we are going to take a look at one of the virtual modules that comes with CV Toolkit, the Biased Switcher.


According to the CV Toolkit manual:

Biased Switcher works similarly to the Mutable Instruments Branches eurorack module. When triggered, the device flips a virtual coin to decide if the incoming stereo signal (BS 1 / BS 2) will be outputted normally (BS1 to BIAS. SW. 1, BS2 to BIAS. SW. 2) or inverted (BS1 to BIAS. SW. 2, BS2 to BIAS. SW. 1). You can also bias the coin, increasing the chances of outputting the signal normally or inverted.

Biased Switcher can be automatically triggered using an internal clock synced to the main transport or manually triggered (Int Trigger) using the Enter key, any MIDI note, or the Step Sequencer.

Although the basic idea is very simple (take an input and randomly decide to which output it should go to), this module is great for adding variation to your patch. 

Here's an example of how you could use Biased Switcher together with the two AD generators to add some variation to a VCA:

 - Set AD1 and AD2 to approximate values
 - Send AD1 to BS1 and AD2 to BS2
 - Set the Biased Switcher ‘Trigger Source’ to Int Trigger
 - Route the first output of the Biased Switcher module (Bias. Sw. 1) to an analog outputs and then patch it to a VCA
Whenever a note is trigger, the Biased Switcher will randomly select one of the two AD generators to send to the analog output. 

Biased Switcher.png

Here are some other cool ideias that you could try:

- Route both LFOs to seperate inputs of the Biased Switcher, route the Bias. Sw. 1 output to an analog output and then patch it to your VCF. You can use this to make CV Toolkit randomly output one of the two LFOs to the filter. 

- Route 'Trigger' to B. S. 1, route each of the 2 outputs of the Biased Switcher (Bias. Sw. 1 / Bias. Sw. 2) to two different analog outputs and then patch those two outputs to the Trigger input of 2 different drum modules. Now, whenever the B.S. module gets triggered, it'll randomly trigger one of the two drum modules.

- You can make your sequence randomly glide by sending the output of the Step Sequencer to both Slew and BS1 inputs, the output of the Slew module to BS2 and then routing the Bias. Sw. 1 output to an analog output (which you should patch to your VCO’s 1 V/oct input). Finally, set ‘Trigger Source’ to Clock, Rate to 1/4 and then set both dials inside the Slew module to ~90ms.

This is a very flexible module and it can help you add variation and randomness to your patch. If you haven't already, take some time to experiment with it!

Until next time!

ChucK repo on GitHub

Hi everybody!

I've been playing around with ChucK a lot lately. ChucK is a great and simple programming language and it's very easy to learn.

Since reverse engineering existing / demo code is my favorite way of learning, I've decided to share a couple of my ChucK projects / programs on GitHub so other people can use and learn from them.

The Spektro Audio ChucK repo is available at:

The first project I've uploaded to the Spektro Audio ChucK repo is a program called GlitchLoop and it's very self-explanatory: it plays a glitch-esque loop using pre-defined patterns for the kick, snare and percussion and a random function that generates glitchy patterns for the hihat.

It sounds like this: 

This is our first open-source experiment and I'd like to encourage everybody to go ahead and use, modify, adapt and re-share everything in any of our GitHub repos (under a GPL V2 license).



Spektro Nucleation 2.0 is out!

Great news everybody: Spektro Nucleation 2.0 is out!

This major (and free!) update brings some exciting new features to our beloved waveshaping device:

• gen~ processing:  During versions 1.0x, Nucleation, like most MaxforLive devices, processed sound in blocks of samples. Now, in version 2.0, it upsamples the signal by 2x and then uses the gen~ technology to process sample-by-sample! This new processing method results in less digital artifacts, less aliasing and a more pleasing timbre for your sound.

• New controls for you to shape your sound even further: offset and shift! Even tho the Offset control already existed in the previous versions, it now works differently due to the new gen~ processing method. The new Shift control allows you to shift the waveform forward in time, completely changing the sound. 

If you've already bought Nucleation in the past, check your email for a download link.

Everything related to this new update (new video and audio demos, change log and etc) can be found at

We're really excited about this new version and we hope you guys have fun with it!

Spektro Nucleation 2.0 - Video Demo / Preview

Hey everybody!

Here's a video demo / preview of the Spektro Nucleation upcoming 2.0 update that we'll be releasing very soon.

The 2.0 update uses the gen~ technology to process sound sample-by-sample. This new processing method results in less digital artifacts, less aliasing and a more pleasing timbre for your sound. 
There are 2 new controls for you to shape your sound even further: offset and shift! Even tho the Offset control already existed in the previous versions, it now works differently due to the new gen~ processing method. The new Shift control allows you to shift the waveform forward in time, completely changing the sound.

For further information, check out

Introducing the Spektro Audio Blog!


This is Icaro Ferre and I'm excited to announce the Spektro Audio Blog!

The idea for this blog is to share what we're currently working on, our audio experiments, tutorials and our opinions about the latest audio news and trends.

Since we're located in Brazil, we'll also be posting in portuguese from time to time. If you are not interested in reading the posts in portuguese, you can click on the English category in order to only see posts in english.

I'd also like to take the opportunity to put live our new website design. I believe it now looks more modern.

In order to celebrate the blog launch, we're offering a 30% discount on any of our products! Just add the product to your cart and use the coupon code spektroblog (coupon code valid until 11/26/2013).

If you'd like to keep up with this blog, you can either subscribe to our RSS feed or follow us on Twitter @SpektroAudio.