Orthonotone

What is an Extrument?

We use the word Extrument to describe hybrid performance systems that extend traditional instruments with spatial mathematics, responsive graphics, and adaptive control surfaces. An extrument is as much an interface for thinking as it is for playing—each one maps geometry, motion, and tone into a cohesive experience that can be explored solo or with an ensemble.

The Othonoquarturnica

The Othonoquarturnica is the current flagship extrument. It renders a rotating four-dimensional polytope and turns its axes, faces, and projected motion into layered audio. Each rotation plane drives a dedicated oscillator bank, filter, and spatialization path. Visual meters and gesture hints keep the geometry legible while signaling how your input is shaping the sound field.

Prototype Capabilities

• WebGL Canvas that visualizes the live projection of the 4D form and responds to camera cues.
• Rotation Controls for X/Y/Z axes with seeded motion so audio begins evolving immediately.
• Multitouch Canvas Gestures where second and third fingers unlock W-plane blends without needing modifier keys.
• Axis Synth Engine combining oscillators, filters, and stereo placement that react to rotation energy.
• Edge Interval Bank that ring-modulates paired planes and surfaces energy through an Edge Resonance Matrix.
• Panel System with collapsible gesture, system, and status panes tuned for desktop and mobile screens.
• Focus Mode that hides every panel for full-stage visuals while keeping an exit control anchored to the viewport.
• Preset Scenes that recall saved motion/audio states while keeping manual tweaks labeled as a custom mix.
• Motion Input (Beta) that lets tilt gestures from supported devices blend with slider and canvas control.

How to Explore This Build

• Tap or click Enable Audio in the System panel or toolbar to wake the synth after the page loads.
• Drag the rotation sliders or use gesture controls to infuse energy into each axis and listen for harmonic shifts.
• On tablets and phones, layer extra fingers on the canvas to reach the extended W-plane gestures without external hardware.
• Use the Edge Resonance Matrix in the Status panel to watch how plane pairings bloom as you stir multiple axes.
• Toggle Focus Mode from the toolbar when you want uninterrupted visuals; the same button exits focus and restores your panels.
• Collapse panels if they crowd the canvas; the layout manager remembers your choices per device size.
• Reset to the Neutral Orbit preset at any time to hear the base tuning and clear accumulated motion.

Where the Prototype Is Heading

We are steering toward a performance-ready v1 that supports collaborative sessions, richer timbral variation, and adaptive visuals. The immediate roadmap focuses on refining accessibility, stabilizing the audio core, and stress-testing the interface on tablets and phones so the extrument feels intentional across contexts.

Deploying This Branch

When publishing via GitHub Pages, select the repository root as the source. All assets are self-contained and use relative paths, so the build will work without additional bundling. The prototype lives in othonoquarturnica.html; this landing page loads first and links to the latest playable build.