changelog
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Baker ADAA (antiderivative anti-aliasing)
2nd-order antiderivative anti-aliasing using Baker's closed-form Chebyshev antiderivatives. replaces 4x oversampling with ADAA + 2x oversampling for ~52 dB alias rejection at lower CPU cost. based on Baker & Bennett (JAES 2025).
signal-dependent dynamic nonlinearity
the waveshaper now "breathes" like real hardware. an envelope follower modulates harmonic coefficients based on signal history. transients stay clean while sustained notes build richer harmonics. each character has distinct warmup behavior: tape magnetizes slowly, tube shifts bias at medium speed, transformer saturates fast.
transfer function endpoint smoothing
reduces Chebyshev T7 oscillation at domain boundaries for cleaner tape saturation at high drive settings.
adaptive oversampling
oversampling adapts to your sample rate: 2x at ≤96 kHz, bypassed at >96 kHz. CPU savings at high sample rates with no loss in quality.
performance improvements
Apple Accelerate vectorization for peak detection, RMS measurement, drive scaling, and mix blending. block-processed IIR filters for K-weight, HF comp, tonal shaping, and tone EQ. 63 automated tests (418 assertions).
- 5-stage processing pipeline: STFT pre-gain, drive computer, Chebyshev waveshaper, post-processing, auto-compensation
- 3 saturation characters (tape, tube, transformer) with per-character asymmetric soft clippers
- 7th-order Chebyshev polynomial waveshaping via Clenshaw recurrence
- 4x oversampling (half-band polyphase IIR)
- program-dependent drive modulation via envelope follower
- K-weighted auto-compensation (ITU-R BS.1770)
- HF compensation for oversampler rolloff
- click-free character crossfade (~10ms)
- zipper-free parameter smoothing
- real-time spectral display with 4 draggable EQ nodes
- 34 factory presets
- 48 automated tests (351 assertions)
perceptual salience weighting
suppression depth is now weighted by perceptual salience. resonances in the 2–5 kHz range (where human hearing is most sensitive) get full treatment, while sub-bass and ultra-high frequencies receive gentler suppression. the result: SMOOTH's default setting immediately focuses on the frequencies that matter most to listeners. zero CPU cost (pre-computed curve).
chirp group delay transient refinement
the transient gate now uses group delay analysis to distinguish genuine transients (drum hits, pick attacks) from tonal modulations (vibrato, tremolo). vibrato no longer causes the gate to incorrectly reduce suppression. guitar picks and key attacks still punch through naturally. no competing resonance suppressor uses this technique.
asymmetric masking gate
the psychoacoustic masking gate now uses asymmetric spreading slopes that match how human hearing actually works. low-frequency content masks higher frequencies more effectively (upward masking), while high-to-low masking is steeper. the result: even more transparent processing on dense mixes with strong bass content.
core engine
5-stage spectral processing pipeline with 40 psychoacoustic ERB bands, spectral reassignment for sub-bin precision, ZDF envelope detection, auto-compensation, Apple Accelerate vectorization. 4 parametric sensitivity nodes with M/S routing. INTENSE mode. Catmull-Rom spectral display. 32 presets. 98 automated tests (26,743 assertions).
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