Quetzalcoatl is a Harmonic Vector synthesiser plugin (VST/AudioUnit) for Mac OS & Windows. It features:
- An 8 stage crossfading oscillator
- Harmonic pitch controls for each stage
- Pan per stage
- Multistage, multimode filter
- 4 Multifunction modulation sources
- A large and diverse sound library
Quetzalcoatl is open source and can be downloaded freely from my GitHub page, this listing is for an expanded version with additional sounds and presets.