Browse agent skills

Sampler-style pitch shift — sinc-interpolated fractional-stride resample (no time preservation)

Spectral Modeling Synthesis (Serra/Smith) sinusoidal+residual pitch shift

Harmonic/Percussive Source Separation pitch shift — shifts harmonics, preserves transients

Adaptive feedback suppression — umbrella for @audio/defeedback-* atoms (analyzer, tracker, notch bank)

Sinusoidal modeling — umbrella for @audio/sinusoidal-* atoms (partial tracking, additive resynthesis, residual)

Lightweight Express.js middleware for capturing and visualising API execution traces in real time.

Synth voice — osc × ADSR through envelope-scaled lowpass (Tone.js Synth class)

MFCC — mel-frequency cepstral coefficients (FFT → mel triangles → log → DCT-II)

Spectral features — umbrella for @audio/spectral-* atoms (centroid, spread, flatness, rolloff, flux, slope, crest, zcr)

CLI-Client for the Swipergy AI Coding Hub

OM-LSA — Optimally Modified Log-Spectral Amplitude (Cohen 2002), with IMCRA noise

Spectral flux onset detection

YIN pitch detection (de Cheveigné & Kawahara, 2002)

McLeod Pitch Method (McLeod & Wyvill, 2005)

Normalized autocorrelation pitch detection (baseline)

Vibrato — pitch modulation via modulated delay line

Tremolo — amplitude modulation via LFO

@audio/effect-slew is a design skill indexed by Skillful.sh. Package: @audio/effect-slew. GitHub stars: 3.

Ping-pong delay — stereo: left and right delays alternate

Chorus — multiple detuned delay lines for ensemble thickening

Frequency shifter — single-sideband shift via Hilbert transform

Linear Predictive Coding analysis/synthesis

Audio-facing biquad filters — highpass, lowpass, bandpass, notch, allpass (Hz/Q params, per-channel state)

Windowed-sinc (Lanczos, 32-tap) resampling with anti-alias kernel widening on downsample

Mel-frequency triangular filter bank

ITU-R BS.1770-4 K-weighting: high-shelf + RLB highpass

Frequency weighting filters — umbrella for @audio/weighting-* atoms (A, B, C, D, K/BS.1770, ITU-R 468, RIAA)

Center-channel vocal isolation & removal

Stereo panner — constant-power panning

Stereo widener — mid/side processing to adjust stereo width