The 267e noise source provides three spectrally distinct noise outputs — integrated (−3dB/oct), musically flat (0dB/oct), and white (+3dB/oct)

The 267e Source of Uncertainty with Filters offers three noise outputs with different spectral shapes. Integrated white noise has a −3 dB/octave rolloff, biasing energy toward lower frequencies. Musically flat noise maintains constant energy per octave across the spectrum. White noise is electrically flat (+3 dB/octave perceptually), biased toward high frequencies. This distinction matters because human hearing does not perceive octaves linearly — musically flat noise is often the best starting point for subsequent filtering, providing equal spectral presence across all perceived frequency bands. The 267e’s built-in filters can be seeded from these noise sources internally without patching.

Examples

Use musically flat noise as a filter input for even-sounding spectral shaping; use integrated (pink-like) noise for wind/rain sound design; use white noise for hi-hat synthesis.

Assessment

Explain why musically flat noise is often preferred over white noise for synthesis starting material. At which noise type would you expect the most high-frequency energy?