SAMPLED

Synthesis and sound design · updated 2026-08-16

ADDITIVE SYNTHESIS

Building a sound by stacking sine waves at chosen frequencies and levels — the inverse of subtractive, and the basis of spectral resynthesis.

Close-up of a Eurorack modular synthesizer: oscillator, filter and envelope modules wired together with patch cables, showing the signal path these synthesis terms describe.
Synthesis and sound design — Close-up of a Eurorack modular synthesizer: oscillator, filter and envelope modules wired together with patch cables, showing the signal path these synthesis terms describe.

Photo: Eurorack Modular Synthesizer Closeup (opens in a new tab) by Nir Yaniv (opens in a new tab), via Wikimedia Commons — CC BY-SA 4.0 (opens in a new tab)

Key takeaways

  • Building a sound by stacking sine waves at chosen frequencies and levels — the inverse of subtractive, and the basis of spectral resynthesis.
  • It offers exact control of spectrum at the cost of complexity, and it is the theoretical inverse of subtractive synthesis.
  • Drawbar organs are additive in practice — each drawbar adds a harmonic at a chosen level.
  • Watch out: trying to build organic instruments additively from static partials.
  • Sits under synthesis and sound design in this glossary, with 2 primary sources below.

Quick checklist

  • Can you define additive synthesis in one sentence without looking?
  • Can you point at additive synthesis in a real session, mix or contract?
  • Have you tried the practical move above at least once?
  • Would you catch the common mistake before it costs you a take?
  • Have you opened one of the primary sources below rather than a forum thread?

ADDITIVE SYNTHESIS IN DEPTH

Additive synthesis builds a sound by summing individual sine waves with their own levels and envelopes. It offers exact control of spectrum at the cost of complexity, and it is the theoretical inverse of subtractive synthesis.

How it works in practice

Drawbar organs are additive in practice — each drawbar adds a harmonic at a chosen level.

The mistake people make

Trying to build organic instruments additively from static partials. Real instruments have partials that move independently over time, and static ones sound artificial.

WHERE ADDITIVE SYNTHESIS SITS

Additive synthesis belongs to synthesis and sound design in the Sampled music glossary. How synths make sound, in the order the signal actually travels.

TEST YOURSELF

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3 quick questions on additive synthesis. Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes additive synthesis?

  2. 2. What is the mistake people most often make with additive synthesis?

  3. 3. In practice, which of these applies to additive synthesis?

Ready for the full thing? Take the 25-question terminology test and get a certificate with your name and score.

SOURCES AND CITATIONS

Free, primary references for additive synthesis — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • Stanford CCRMA — spectral audio signal processing (opens in a new tab)

    University research centre · Stanford CCRMA

    “Building a sound by stacking sine waves at chosen frequencies and levels — the inverse of subtractive, and the basis of spectral resynthesis.”— the claim this source supports

    Why it counts: The CCRMA course material derives this from first principles, so you can check the maths behind the plain-English version above.

  • UC Berkeley CNMAT (opens in a new tab)

    University research centre · UC Berkeley (CNMAT)

    “Additive synthesis builds a sound by summing individual sine waves with their own levels and envelopes.”— the claim this source supports

    Why it counts: Berkeley's research notes cover the implementation detail that day-to-day usage of the term skips over.

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