HSP Spatial
A hybrid spatial audio processor for post-production. Music and dialogue upmixing, format-agnostic panning, binaural monitoring and real-time head-tracking — in one plugin, up to 9.1.6.
Built For
Two clearly separated use cases.
Music
Stereo-to-immersive conversion for Dolby Atmos and other immersive music deliverables, with transient-protected ambience expansion — the beat and lead vocal stay locked in place while the room opens up around them.
Post-production / dubbing stage
Dialogue-focused film upmixing, hard center extraction, and a live head-tracked binaural check per scene — without leaving the timeline.
What It Does
One plugin, a full spatial signal chain.
Hybrid upmix engine
Two purpose-built modes: Music mode separates direct from diffuse content by bin-wise coherence analysis — width and surround controls move only the ambience, never the beat or lead vocal. Dialogue mode locks speech to the center channel with hard center extraction.
Exact Downmix Guarantee
Every upmix and steering decision is built under a constraint that mathematically guarantees the Lo/Ro fold-down returns your original stereo mix — measured and reported live, never silently corrected.
Format-agnostic panning
Quaternion-based 3D rotation with click-free, per-sample matrix interpolation. Bit-transparent at zero rotation; anything beyond that is a deliberate, clearly reported creative choice.
Binaural monitor with real head-tracking
A zero-impact second stereo bus for headphone monitoring — spherical head model or measured HRTF, with real OSC head-tracking using the same protocol as leading head-tracking hardware and renderers.
Host-independent monitor output
Streams straight to a chosen system audio device — your headphones — without touching Pro Tools' I/O routing.
Offline batch tools
A command-line render tool for offline analysis and rendering, with split output files ready to drag straight onto tracks.
Engineering Discipline
Built to be trusted, not just to work.
93 automated tests
63 core DSP tests (math, fold-down null tests, thread-safety) plus 30 plugin integration tests — real plugin instantiation, real OSC packets, real file-system access.
Validated on real hardware
Fast iteration in a Linux container, final validation on real Mac hardware — real head-tracking hardware, real audio output, real Pro Tools sessions.
Status
Where it stands today.
Working
In Progress
In Development
HSP Spatial is still being built.
Pricing hasn't been finalized yet. Leave a message and be the first to know when it ships.
Made by Cem Tuncer on behalf of CT Music Productions LTD.