Chirp oscillators modelled on the Fractional Fourier Transform. Each operator uses a Hermite‑Gaussian waveform (eigenfunction of the FrFT). The eigenspace filter approximates the four DFT projection operators (λ=±1, λ=±i).
The four DFT projection operators: λ=+1 (even/symmetric) · λ=−1 (inverted even) · λ=+i (odd/transient) · λ=−i (inverted odd)
Retunes all oscillators using Scala (.scl) scales. When enabled, every engine (Subtractive, FM, Wavetable, Spectral) uses the selected tuning. Root note sets which MIDI key plays degree 0 of the scale.