Realtime-safe core
No allocation in render; host-independent parameter, MIDI, tempo, and stereo interfaces.
← Product engineering
VST3 polyphonic synthesizer · v0.12.1
LUMEN
A playable synth with one visible signal path.
An eight-voice instrument built around a portable C++ DSP core, stable host parameters, and a Push-first control contract.
Architecture
The system behind the surface.
JUCE hosts a portable, allocation-free render core shared with offline verification. Oscillator generation, nonlinear drive, and four-pole filtering run at 4× the host sample rate; control smoothing stays inside the DSP rather than the UI.
Signal and data flow
01
MIDI + expression
02
Voice engine
03
Band-limited oscillators
04
4× filter + drive
05
Stereo + space
06
Host output
Engineering decisions.
Stable host contract
Named parameters and useful Push banks remain part of the product API.
Musical state
Twelve factory instruments preserve authored rhythmic divisions and expression response.
Verified DSP
Portable tests cover the same sound engine used by the plug-in wrapper.
The product experience
See LUMEN on gusvega.com →