Two-stage hierarchy
Seven song stems can open into six independently controlled drum components.
← Product engineering
VST3 stem separation + performance mixer · v0.6.1
SPECTRA
An offline ML pipeline inside a realtime creative workflow.
Seven song stems, six drum components, Metal acceleration, bounded high-resolution caching, synchronized mixing controls, and direct FORMA handoff.
Architecture
The system behind the surface.
Separation and cache writes stay away from the audio callback. Immutable sample-aligned buffers feed realtime gain, mute, solo, seek, and playback controls. Metal is chosen when useful and CPU remains the fallback.
Signal and data flow
01
File decode
02
Background models
03
FLAC cache
04
Aligned stem buffers
05
Realtime mixer
06
WAV export
Engineering decisions.
Bounded cache
Eight recent songs and a 12 GB target prevent repeated analysis without unbounded storage.
Adaptive acceleration
Short clips avoid Metal startup cost; unsupported operations fall back to CPU.
Creative handoff
Quick-save produces 24-bit WAV stems and updates FORMA’s latest-source shortcut.
The product experience
See SPECTRA on gusvega.com →