fft()

fft(x, brightness, resonance, warp)

Description

Creates a cached spectral wavetable oscillator. Syntropy builds a harmonic spectrum internally, normalizes it, and reads it as a smooth oscillator table. Use X as the first argument for normal MIDI-note pitch tracking.

The function is useful for modern digital pads, spectral leads, glassy plucks, resynthesis-like tones, and sounds that need a harmonic shape between clean additive synthesis and wavetable synthesis.

Arguments

x: oscillator phase. Use X for the played MIDI note, or ratios such as 0.5*X, 2*X, or 1.01*X for octave and detuned layers.
brightness: harmonic falloff control in the 0..1 range. Lower values keep more upper harmonics; higher values produce a darker, smoother spectrum.
resonance: spectral peak amount and position in the 0..1 range. Higher values emphasize a narrower moving harmonic region, similar to a formant or spectral resonance.
warp: deterministic spectral variation in the 0..1 range. It changes harmonic amplitudes and phases for more irregular, wavetable-like character.

Examples

0.35*fft(X, 0.35, 0.18, 0.10)

attack(400)*release(18000)*
moog(
  0.42*fft(X, param(0), param(1), param(2))+
  0.28*fft(1.005*X, 0.25+0.55*param(3), 0.12, 0.30),
  0.04+0.42*param(4),
  0.15+0.55*param(5)
)

Practical Use

For soft pads, use higher brightness and low warp.
For digital leads, use lower brightness, moderate resonance, and a small detuned second layer.
For evolving timbres, modulate brightness or resonance slowly with LFO(), env(), or sfromtoin().

Notes