pd-hybrid-synth

PD Hybrid Synth is an open-source synthesizer that integrates multiple synthesis engines and filter types. It features a headless DSP core developed with a test-first approach, utilizing FFT and spectral analysis for verification. Key capabilities include: **Oscillator Engines**: - Phase Distortion: Casio CZ-style synthesis with eight waveshapes. - Analog-modeled: Bandlimited Saw, Square, Triangle, and Pulse oscillators using PolyBLEP. - Vector PS: Vector Phaseshaping for formant sweeps and hard-sync timbres. - Scanned: Scanned synthesis using a 128-mass spring ring. - VOSIM: Voice simulation for vocal and speech-chip characters. - Walsh: Walsh-function synthesis for digital, gritty tones. - Additional features: Ring modulation, hard sync, phase modulation, and Karplus–Strong pluck. **Filter Options**: - Ladder: Moog-style 4-pole lowpass. - State Variable: 12 dB/oct filter with LP, BP, HP, and notch modes. - PD Resonator: A damped quadrature resonator with phase-distortion. - Comb: Tuned feedback comb/waveguide. - Allpass: Cascade of allpass sections for transient dispersion. **Additional Features**: - Multi-stage envelopes (ADSR and CZ-style). - Oversampled overdrive amp. - Modulation matrix, chorus, reverb, and arpeggiator. - GUI featuring a CRT output scope. - Support for VST3 and Standalone formats across Windows, macOS, and Linux.