What Are Synths In Music?
Discover the fascinating world of synths in music. Uncover their history, types, and impact on modern soundscapes.
May 28, 2026
Read time: 8 mins
Synthesizers are so versatile that they've become a critical tool in the workflow of most music producers. The ability of a synth to replicate and modify existing sounds, combined with its flexibility and compatibility with modern music software, makes it the ideal instrument to define and expand an artist's sonic palette.
What Is a Synthesizer?
Synthesizers are electronic instruments that generate and manipulate sounds. Do you need lush pads? You can have them. Futuristic synth textures? No problem. You can replicate any analog instrument with a synth and modify it to bring a new sound to life.
The process of creating sound with a synthesizer starts with an oscillator. An oscillator generates an electrical signal at a particular frequency, determining the sound pitch. This electrical signal is then sent through a series of circuits that modify the signal in different ways, such as filtering, amplifying, and shaping the waveform.
By artificially reproducing the sound of an acoustic instrument, the synth allows the modern producer to alter every characteristic of the reproduced audio, unlocking endless creative possibilities without buying dozens of different tools and effects.
History of Synthesizers
In the early 20th century, many creative minds worked hard to create what today can be considered as the earliest examples of modern synthesizers: from the 1920s' theremin to the Hammond organ (Deep Purple, anyone?) and the RCA Electronic Music Synthesizer Mark I.
Then came the Moog synthesizers in the 1970s, which introduced a whole new level of control over sound synthesis. American engineer Robert Moog invented this iconic line of synthesizers, which quickly gained popularity. Groundbreaking rock bands (Pink Floyd, The Beatles, The Doors) and electronic music pioneers alike (the krautrock music scene, Jean-Michel Jarre, Giorgio Moroder) embraced this new method of sound synthesis.
Pink Floyd - On The Run (PULSE Restored & Re-Edited)
The rest is history. In the 1980s, there was a boom in digital synthesizers, which made the most of the advancements in computer tech to create even more complex and realistic sounds, becoming the backbone of many new music genres, from hip-hop to dance and techno.
Since the 1990s, when music production started shifting towards the digital realm, virtual analog synthesizers and software synthesizers that could run on computers have become essential tools in the arsenal of music producers. Over the years, synths have become more and more accessible, offering endless options to musicians and producers of all levels.
What are the Different Types of Music Synthesizers?
Hardware synths are standalone synthesizers that you can physically touch and use to manipulate sound waves, while software synths are digital synthesizers that you can control from a computer or mobile device.
- Analog Synthesizers: These are the original synthesizers created in the 1960s and 70s. They use analog circuits to generate sounds, and they're known for their warm, rich tones.
- Virtual Analog Synthesizers: These synthesizers use digital signal processing to recreate the sounds of analog synthesizers. Sound-wise, they're designed to recreate their analog counterparts as faithfully as possible, and are much more affordable.
- Digital synthesizers: These synths use digital signal processing to generate sounds, meaning they can create a wide variety of sounds and textures. Digital synthesizers can be polyphonic or monophonic (more on this later), and they often have many modulation options that allow for complex sound design.
- VST synthesizers: VST stands for Virtual Studio Technology, and a VST synth is a software synthesizer that works within a digital audio workstation (DAW). VST synthesizers are highly versatile and can emulate many sounds, from classic analog synths to modern digital ones.
- Mono and poly synths: Mono synths are capable of producing only one note at a time, while poly synths can play multiple notes simultaneously. Polyphonic synths are typically more expensive and complex than monophonic ones because they offer a more comprehensive range of chord progressions and harmonic possibilities.
- Modular synthesizers: Modular synthesizers consist of separate modules that can be combined to create unique soundscapes. Creating a modular synth can be insanely expensive, but it's also a great way to bring to life a sound that's uniquely yours.
- Sampling Synthesizers: Sampling synthesizers use recorded samples of real instruments or sounds to create new textures. They're commonly used in hip-hop and electronic music to make beats and loops.
Photo by Avi Naim
How Do Synthesizers Work?
At the heart of every synthesizer are four key building blocks: Frequency Oscillators, Filters, LFOs, and ADSR Envelopes. Let's take a look at each element.
Frequency Oscillators
Responsible for generating the basic sound waveforms, these oscillators produce different types of waves (sine, square, triangle, and sawtooth). By adjusting the frequency and waveform of these oscillators, you can create different tones and timbres.
Filters
Filters shape the sound by attenuating or boosting specific frequencies. For example, low-pass, high- pass, and band-pass filters each affect audio signals in their own ways, and can be positioned to affect specific frequency ranges.
LFOs (low-frequency oscillators)
LFOs produce sound waves at a much slower rate than frequency oscillators, and they are used to create acoustic effects such as vibrato and tremolo. If you want to add a realistic effect to your track, adjust the rate and depth of the LFO.
ADSR envelope
ADSR stands for Attack, Decay, Sustain, and Release; characteristics that can help you shape sounds in an endless amount of ways. Adjusting these parameters lets you control how the sound starts, sustains, and ends. For example, a fast attack and quick decay will create a sharp, percussive sound, while a slow attack and long sustain will create a smooth, flowing sound.
With a synth, you can also create unique vocals and take them to the next level. Antares Mutator is the ultimate tool for sound designers and producers who want to craft otherworldly, high-quality vocals: thanks to advanced throat modeling, pitch-shifting technology, and unique effects, you can bring to life extraordinary voices to use for your projects.
Why Should You Use a Synth?
Whether you're a seasoned producer or a newbie, a synthesizer is a must-have tool if you want to expand your sonic palette:
- A synthesizer is a versatile instrument that is capable of generating sounds that traditional instruments can't. With a synth, you have complete control over every aspect of the sound, from the waveform to the filtering and modulation. This means you can create melodies that are unique, futuristic, and truly your own.
- Synthesizers can help to unlock the potential of other instruments. For example, you can use a synthesizer to create a bassline that perfectly blends with a guitar riff or to add atmospheric pads to a piano melody. By layering different sounds together, you will create a rich, textured soundscape that's much more than the sum of its parts.
- Synthesizers are indispensable tools for sound design. Whether you're creating sounds for a film score, a video game, or music, a synthesizer can help you to make the best sound to fit your project.
- Unleash your creativity! With such a vast sonic palette at your disposal, you can experiment with a synth for hours until you find the perfect sound you are looking for.
Role of Synthesizers in Modern Music
The role of synthesizers in modern music is critical.
In pop music, synthesizers can create catchy hooks and melodies that are easy to remember. In electronic dance music, producers use synths to create driving bass lines that captivate and energize crowds to keep them dancing all night long.
In rock music, synthesizers can add variety, texture, and depth to the music, creating a richer vibe that is almost impossible to get with traditional instruments. Hip-hop is another genre where synthesizers have played a significant role: producers often use them to create unique sounds that can set a particular track apart from all the others.
Ultimately, the endless customization and affordability of synths make music production accessible to anyone, allowing artists to express their creativity fully without requiring expensive gear or professional recording studios.
Frequently Asked Questions
How does a synthesizer work?
A synthesizer works by routing a signal through four key stages: an oscillator generates the raw waveform (sine, sawtooth, square, or noise); a filter shapes the frequency content by cutting or boosting specific ranges; an amplifier controls the volume over time; and an envelope or LFO (low-frequency oscillator) adds movement and dynamics. This signal chain — often called subtractive synthesis — is the foundation of most modern synths, though other methods like FM synthesis and wavetable synthesis also exist.
What is the difference between a synth and a keyboard?
A keyboard is a physical interface — the set of keys you play. A synthesizer is the sound-generating engine behind those keys. All synthesizers with keys have a keyboard, but not all keyboards are synthesizers — a digital piano, for example, uses pre-recorded samples rather than generating sound electronically. The term "synth" specifically refers to the sound design engine: oscillators, filters, and modulators that create sound from scratch.
What are the main types of synthesizers?
The four most common types are: analog synths, which generate sound using electrical voltage and are prized for their warm, organic tone; digital synths, which use mathematical algorithms and offer greater precision and range; software synths (VST plugins), which run inside a DAW on a computer; and wavetable synths, which scan through stored waveforms to create evolving, complex timbres. Each type has distinct sonic characteristics suited to different production styles.
What kind of music uses synthesizers?
Synthesizers are used across virtually every genre. They are foundational to electronic, EDM, house, techno, and hip-hop production. They are central to 80s pop, synth-wave, and ambient music. And they appear as supporting instruments in rock, R&B, film scores, and country. The synthesizer is considered one of the most influential instruments in music history, largely responsible for shaping the sound of popular music from the 1970s onward.
Can synths replace real instruments?
Synths can replicate the sound of real instruments — strings, brass, piano, and more — with varying degrees of realism depending on the quality of the synthesis or sampling. However, most producers use synths not to replace acoustic instruments but to create sounds that don't exist in the physical world. The unique capability of synthesizers is sound design: building textures, pads, leads, and atmospheres that go beyond what any traditional instrument can produce.
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Antares is a leading developer of software for music recording and live performance. For over 20 years, Antares has powered the music of top-charting and indie artists with products including the industry standard for pitch correction, AutoTune™.