Virtual Analog Subtractive Synthesizers

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on Jan 08, 2017 in Synths & Sound Design 4 comments

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Virtual Analog Subtractive Synthesizers For Beginners
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Odsay is a two-oscillator virtual analog synth featuring subtractive synthesis. The VST features sawtooth, square, and pulse waveforms which can be modulated by: LFO or ADSR-envelope, white/pink noise, oscillator-sync modulated by ADSR, an LFO or sample-and-hold. Filtering in this virtual analog synthesizer can work in two completely different modes: Mode of subtractive filtering, Mode of additive filtering. These two modes need to be more explained. Mode of subtractive filtering - filters are actually blocks into which the signal enters and the filtered signal outputs. Filtering in this mode means that something is being removed from the signal - of which the name.

There's no doubting the joy of using a real hardware synthesizer. The tactile controls are difficult to beat. But when it comes to sound these 7 virtual synths more than hold their own.

1. Spectrasonics Omnisphere 2

Omnisphere is one of those synths that would probably turn up on just about everyone’s lists. Like many of the synths on this list, Omnisphere (currently Omnisphere 2) combines a number of synthesis techniques, including both oscillators and sample-based source material (including user waves), wavetable synthesis, granular synthesis, and even FM. Combining a huge factory library with comprehensive programming options, the emphasis is on heavily processed sounds of all kinds, from traditional synth tones to dense swirling pads to arpeggios to shifting, chugging, twinkling soundscapes and musical noises that defy easy description. Playability includes nice touches like the Orb, a real-time joystick-type controller that can simultaneously vary many parameters. Omnisphere has been around for quite a while, and has certainly earned its place on a list of soft synths that hardware synths really can’t touch.

Web:https://www.spectrasonics.net/products/omnisphere/index.php

Review: https://ask.audio/articles/review-spectrasonics-omnisphere-2

Courses:https://ask.audio/academy?nleloc=application/omnisphere

2. NI Massive

Native Instrument’s Massive is another synth that’s been around for years, and its popularity and sound pretty much guarantee it a place of honor. Massive follows a traditional subtractive synthesis models, with oscillators (three, plus noise) filters (two), amplifier, modulation (LFO), and effects. But there’s much more to it than that simple description suggests.

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Massive’s oscillators are more than just simple analog waves (like sine, square, sawtooth, pulse, etc.)—they’re Wavetables, which, besides those basic, traditional shapes, also include a large collection of richer and more complex wavetables to use as raw material, making for a much wider range of possible sounds. The overall subtractive architecture is familiar enough to be accessible to most synthesists, yet it offers extra levels of flexibility, accessed from the various programming tabs in its center panel, like the Routing panel, where you can view and tweak the signal flow of the various modules that make up a patch, and the drag-and-drop icons that make quick work of building up modulation patching. All in all, Massive’s combination of accessibility and flexibility have made it a perennial favorite among synthesists of all stripes.

Web:https://www.native-instruments.com/en/products/komplete/synths/massive/

Courses:https://ask.audio/academy?nleloc=application/massive

3. NI Reaktor

Another entry from Native Instruments, Reaktor (currently Reaktor 6) is not really a synthesizer per se—it’s potentially every synthesizer you could imagine. Reaktor is an object-oriented programming environment for building your own synthesizers, and it’s one of the most powerful tools available for those who want ultimate control over their instruments. But you don’t have to have a degree in computer programming or DSP to use Reaktor—while it does contain a daunting set of under-the-hood tools and building blocks, it also comes with a large collection of finished synthesizer designs—called Ensembles—and there are many more available from third-parties as well. Some of these are available as separate, stand-alone synths, like NI’s own Razor (an additive synthesis design), Prism (a physical modeling instrument), and Monark (a well-regarded take on the venerable Minimoog).

But the real power of Reaktor comes when you go behind the front panel, and delve into the nuts & bolts of synthesizer architecture. Taking full advantage of everything the programming environment has to offer may require a significant investment in time and energy, but for inveterate tweakers it’s well worth the effort, going well beyond even the possibilities available from assembling your own modular synth in the real world.

Web:https://www.native-instruments.com/en/products/komplete/synths/reaktor-6/

Virtual Analog Subtractive Synthesizers For Beginners

Review: https://ask.audio/articles/review-native-instruments-reaktor-6

Courses:https://ask.audio/academy?nleloc=application/reaktor

4. Rob Papen Blue II

Rob Papen offers a number of popular synths (like Predator, Blade, and others, including the now-discontinued Albino), but Blue (currently Blue II) is probably the flagship of the line. Utilizing when Papen has dubbed “Cross-Fusion Synthesis”, Blue II combines FM, Phase Distortion, Waveshaping, and Subtractive synthesis, to create one highly flexible and great-sounding instrument. No less than six (!) oscillators freely combine all the different methods of sound generation in a single patch, and the graphic display makes routing and processing relatively easy for a synth with so many options. The helpful graphic displays include features like a straightforward FM matrix and graphic envelopes, along with sequencer and arpeggiator pages, and make Blue II’s programming power readily accessible, making it easy and efficient to tweak sounds—far easier than twiddling hardware knobs blindly.

Review: https://ask.audio/articles/review-rob-papen-blue-ii

5. LennarDigital Sylenth

LennarDigital’s Sylenth has become a very popular synth of late. Unlike many of the other entries in this list, it’s not a be-all, do-all, end-all design. Sylenth is designed to do one thing—emulate classic analog synthesis—but do it exceptionally well. It’s a dual-layered design, with 4 traditional analog-style oscillators, and a classic subtractive synthesis architecture. All the virtual analog components were carefully designed to offer the rich sound of their real analog counterparts, with alias-free oscillators, and filters that include nonlinear saturation and self-oscillation options.

A comprehensive set of envelopes, modulators, and an arpeggiator is rounded off with a full array of audio effects—everything needed to achieve classic analog synth sounds with the warmth and edge of traditional hardware synths is included. A faux LCD panel helps simplify programing the more tweaky features, and flexible routing allows for the two oscillator layers to cross-feed the filters, making for an especially nice bit of analog character in the digital world.

Web:https://www.lennardigital.com/sylenth1/

Course:https://ask.audio/academy?nleloc=topic/sylenth

6. U-he Diva & Zebra 2 & Repro 1

U-he is not a synth, it’s a company—actually it’s software developer Urs Heckmann (plus a small staff), who’s come up with many excellent and characterful synth designs (and effects plug-ins) over the years, many available as freeware (like the popular Zoyd synth, and the unique Triple Cheese, which uses comb filters to generate/process its sounds). The U-he line includes several synths, but I want to focus on two of the most popular, Zebra 2 and Diva.

Urs describes Zebra 2 as a “wireless modular synthesizer”—it incorporates many types of synthesis, including subtractive, additive, and FM, along with an equally versatile array of sound-modifying tools like comb-filtering (physical modeling), all freely patchable. Only modules used in a particular patch are displayed, reducing front-panel clutter, and making for a more streamlined interface. The centrally-located modulation grid offers an easy way to connect modules, and helps visualize signal flow in complex patches. And for performance, Zebra 2 offers a “Perform” panel, with no less than four (!) programmable and assignable X/Y pads.

Diva, on the other hand, is a more dedicated analog-style synth—it models the sounds of various classic analog synth modules. But two things set it apart from other analog modelers. The first is that you can mix and match components/modules inspired by different synths, creating hybrid designs. The other is Diva’s cutting-edge approach to modeling analog circuits, which promises to achieve the next level in emulating the nuance of real analog instruments. This faithfulness to real analog sound brings with it a bit of a CPU hit, but users have embraced it, so this Diva may be worth her high-maintenance ways.

Web:https://www.u-he.com

Review: https://ask.audio/articles/review-uhe-repro1

Course:https://ask.audio/academy?nleloc=application/uhe

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7. AAS Modeling Collection

Virtual Analog Subtractive Synthesizers 2

As I said earlier, lists like this typically combine entries that are on everyone’s top-10 with choices of a more personal nature—this last entry probably reflects my interest in physical modeling techniques. AAS—Applied Acoustic Systems—makes a variety of virtual instruments and “sound banks”—their instruments are based on physical modeling, which, as you may know, is a method of creating a sound by emulating the physical way that sound is created in the real world. So instead of traditional oscillators, filters, and envelopes, you’ll typically find exciters, disturbers, and resonators—simulations of different vibrating materials, striking, plucking, bowing, and blowing techniques, and complex resonances and timbral responses.

AAS’s modeling collection includes instruments that put these kinds of tools to use emulating strings, guitars, electric pianos, and even analog synth circuitry, but the two I want to mention are Tassman, a general-purpose physical-modeling synth, and their latest, Chromaphone, which is dedicated to modeling all manner of percussive sounds. Both of these instruments let the user synthesize highly realistic sounds, thanks to the physical modeling of acoustic sound-generation, but those sounds don’t necessarily have to emulate actual instruments—for more creative applications, the modeling tools can be used to create very acoustic-sounding instruments that don’t—maybe couldn’t—actually exist in the real world, but sound (and play) like they do! Physical modeling technology is widely used nowadays for processing—component modeling is routinely employed to simulate the circuit path of classic analog hardware, including synth components like oscillators and filters—and it’s gradually being applied more to instrument design.

Web:https://www.applied-acoustics.com/modeling-collection/

Wrap-up

Like with any list, there are plenty more great synths I could have included but didn’t, for one reason or another (I decided to limit my choices to separate plug-ins, eliminating obvious possibilities like Alchemy and Sculpture, which are exclusively built-in to Logic). I also didn't include any audio examples—how can you boil the characteristic sound of synths that each offer so much variety into a few seconds of one or two patches? There are plenty of audio demos available online, along with trial versions of most, if not all, of the synths I mentioned, and I think the best approach for anyone who wants to get to know what particular models are capable of is to go ahead and try ‘em out yourself—a little homework that, for once, should actually be a lot of fun!

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