Dub Siren Online — Waveforms, LFO & Pitch Tutorial
What Is a Dub Siren?
The dub siren is one of the most iconic sound effects in dub and reggae music. It produces a sweeping, oscillating tone that sound engineers use to punctuate and accentuate mixes.
Traditionally built from simple analogue oscillator circuits, the dub siren creates its distinctive wailing sound by modulating pitch with a low-frequency oscillator (LFO).
Waveform Selection
Choose between four oscillator waveforms: sine, square, sawtooth, and triangle. Each produces a different tonal character.
Sine waves give a smooth, pure siren tone. Square waves produce a harsher, buzzy sound. Sawtooth waves are bright and cutting. Triangle waves sit between sine and square — slightly edgier than sine but smoother than square.
Pitch Control
The Pitch knob sets the centre frequency of the siren oscillator. Lower values produce deep, bass-heavy tones, while higher values create piercing, high-pitched wails.
Experiment with different pitch ranges to find the sweet spot for your mix. Classic dub sirens often sit in the mid-range where they cut through the mix without clashing with bass frequencies.
LFO: Speed and Range
The LFO (Low-Frequency Oscillator) is what makes the siren sweep up and down. Speed controls how fast the pitch oscillates — slow speeds produce lazy, drifting sweeps, while fast speeds create urgent, warbling effects.
Range controls how far the pitch sweeps from the centre frequency. A narrow range gives subtle vibrato, while a wide range produces dramatic pitch swoops across several octaves.
Reverb
The siren includes a built-in reverb send. Add reverb to place the siren in a space and give it depth and sustain beyond the dry signal.
Heavy reverb on a siren is a signature dub sound — the tail of the reverb continues ringing after you release the trigger, creating an atmospheric wash that decays naturally.
Performance Tips
Use the siren sparingly for maximum impact. A well-timed siren blast at the start of a dub section or during a drum break can be hugely effective.
Try combining the siren with the tape echo — trigger a short siren blast and let the echo repeats carry it into rhythmic patterns. Experiment with changing pitch and speed while the echo is feeding back for evolving, psychedelic textures.