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Synthesis

Oscillator

An oscillator is the fundamental sound-generating component of a synthesizer, producing a repeating waveform at a specific frequency. The four main waveforms—sine, sawtooth, square, and triangle—each have distinct harmonic content and tonal qualities that form the raw material for all synthesized sounds.

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Each waveform type has a characteristic harmonic spectrum:

  • Sine wave: Contains only the fundamental frequency—pure, clean, and smooth. Used for sub bass and simple tones.
  • Sawtooth wave: Contains all harmonics (odd and even)—bright, buzzy, and rich. The foundation of leads, pads, and supersaws.
  • Square wave: Contains only odd harmonics—hollow, nasal, reedy. Classic for bass and retro synth sounds.
  • Triangle wave: Contains only odd harmonics but with reduced high-frequency content—soft, flute-like. Used for gentle leads and pads.

Most synthesizers combine multiple oscillators with slight detuning, different waveforms, or different octave settings (oscillator stacking) to create more complex, textured sounds than a single oscillator can provide.

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