Looped noise is a short random segment played on repeat, making it tunable unlike true white noise

White noise is an infinite random sequence with flat spectral density — it has no pitch and cannot be tuned. Looped noise takes a very short random segment and plays it cyclically, like a tiny noise sample looped. Because the period is fixed, the repetition rate corresponds to a fundamental frequency that can be changed by the playback rate. The result sounds like pitched noise — useful for snare synthesis where the noise component needs to blend with a tonal membrane fundamental. True white noise has no periodic content and therefore cannot be pitch-bent, while looped noise sacrifices spectral flatness for tunability.

Examples

Ableton Operator: use ‘Noise Looped’ waveform on the modulator oscillator; changing its coarse/fine tuning shifts the perceived noise pitch. Use for analog-style snare where the noise ‘sizzle’ tracks the snare tuning.

Assessment

Explain why shifting the pitch knob on a white noise generator has no effect on its frequency content, but the same knob on a looped noise generator does. Then describe a musical context where tunable noise is preferable.