Sound Field

A spatial map of a stereo song: frequency rises, time recedes, panning spreads left-to-right, and loudness becomes opacity.

● Analysis stays in this browser

1. Load a song

Drop an MP3 or WAV hereor click to choose a file

No file loaded

Balanced desktop detail · up to ~156,000 points

Add B mix for comparisonsame song, alternate version

No B mix loaded

2. Listen & inspect

Minimum loudness −72 dBFS Point size 100%

Essentia will detect BPM and individual beat timestamps. Set Beat 1 manually to mark four-beat measures.

Low frequency 35 Hz High frequency 18 kHz

Frequency balance—low ↔ high percentile

Stereo balance—energy-weighted lean

Volume rank—versus this song

Balance snapshot uses the two-second window around the playhead. It is a navigation aid, not a mastering target.

Advanced indicators

Stereo correlation—−1 phase risk ↔ +1 mono

Stereo width—side energy share

Dynamic punch—crest factor

Low-end width—side energy below ~120 Hz

LUFS-I (estimated)—approximate

Decoded sample peak—not true-peak

Rendering—rendered / eligible

Colour guide

Mostly left Near centre Mostly right

These colours show stereo placement—not instruments. True instrument colours need stems or AI separation.

Give a song some space.

Load a stereo audio file, then drag the model to orbit it. Empty regions can reveal room for a sound in the mix.

X · stereo panY · frequencyZ · song timeline · START → ENDopacity · loudness

Waiting for an audio file.

Navigation

Playback position0:00Z-axis view position0:00Inspection region start0:00Inspection region end0:00

Space · play/pause · ←/→ · tap 5s or hold to scrub · H · controls · drag · orbit · pinch/scroll · zoom

What’s new in Sound Field

Running version 26 · newest changes appear first

v26 · Spectrogram and advanced indicators

Replaced the crowded frequency-point reference with a continuous stereo-coloured scrolling spectrogram.
Added an expandable Advanced indicators panel while preserving the original three-card balance summary by default.
Added live two-second stereo correlation, stereo width, dynamic punch, and low-end width measurements.

v25 · Progress colours and tracking snapshots

Played points become dim monochrome, the current moment receives a narrow highlight, and upcoming points retain their full spatial colour.
Added a Timeline colour toggle to switch between Progress and All colour.
Snapshot references now slide smoothly through a larger cached time buffer, keeping the playhead centred without repainting the point field every frame.

v24 · Smooth snapshot playback

Snapshot reference views keep a stable 20-second point field while the playhead moves through it.
The expensive reference point raster is rebuilt only as playback approaches the cached edge.
Seeking recentres the snapshot immediately.
Mobile users can swipe vertically directly over either reference view to scroll.

v23 · More frequency detail and focused references

Doubled analysis from 34 to 68 logarithmic frequency bands.
Increased the FFT from 1,024 to 2,048 samples for approximately 21.5 Hz raw resolution at 44.1 kHz.
Max now reaches roughly 625,000 complete analyzed points.
Added Snapshot and Entire song scopes for the synchronized reference viewers; Snapshot defaults to ±10 seconds around playback.
Added audible beat auditioning with four-beat accents after Beat 1 is set.

v22 · Reference projections and real beat timestamps

Added synchronized Side and Top reference views beneath the perspective visualizer.
Reference views are square, side-by-side on desktop, stacked on mobile, and optional for performance.
Replaced the homemade BPM detector with Essentia RhythmExtractor2013.
The beat grid now follows detected beat timestamps rather than extrapolating one estimated interval.
Four-beat measure lines appear only after Beat 1 is deliberately set.
Added a live two-second Balance snapshot for frequency, stereo lean, and within-song volume percentile.

v21 · Max detail and trustworthy beat grids

Added Max analysis at twice Ultra's time resolution—up to about 313,000 points.
Added a synchronized play/pause button to the visualization dock for desktop and mobile.
Rebuilt tempo detection around multi-band onset energy instead of whole-song loudness changes.
Separated beat phase from four-beat downbeat detection so thick measure lines are no longer arbitrary.
Beat status now reports confidence and warns when manual correction is recommended.

v20 · Complete GPU point rendering

Moved the point cloud to WebGL so every eligible point is submitted to the GPU.
Removed adaptive point budgets and visual-data subsampling.
Standard, Detailed, and Ultra now change analysis resolution only.
Draw-distance, loudness, and frequency filters hide complete regions or values—never random samples.
Added a complete all-points Canvas fallback when WebGL is unavailable.
Performance reporting now shows rendered eligible points and the active rendering engine.

v19 · Stable points and musical floor grid

Replaced scattered beat/transient markers with a clean BPM-aligned floor grid.
Added Off, Measures, and Beats grid modes plus manual BPM and beat-one alignment.
Added clear Start and End labels along the song timeline.
Made point selection deterministic so orbiting no longer changes which dots are present.
Capped active rendering at 30 FPS and added camera-centred draw distances.
Added two-finger pinch zoom on touchscreens.

v18 · Changelog and responsive controls

Added this built-in, scrollable version history.
Added Expanded, Compact, and Hidden navigation-control states.
Phones and smaller touch devices start in Compact mode.
The selected control layout is remembered in this browser.
Press H to cycle through control layouts.

v17 · Advanced inspection workspace

Adaptive rendering keeps complete analysis data while drawing a manageable visual subset.
Added focused time windows, selected-region looping, and frequency filtering.
Added estimated BPM, manual BPM override, beat guides, and transient markers.
Added local A/B mix comparison at a matching relative position.
Added contextual notes that preserve timestamp and camera view in shared links.
Added performance reporting and clarified decoded sample-peak reporting.

v16 · Analysis detail

Added Standard, Detailed, and Ultra analysis resolutions.
Added automatic reanalysis when quality changes.
Displayed the actual seconds-per-slice resolution.
Included analysis quality in shared-view links.

v15 · Keyboard scrubbing

Arrow-key taps move five seconds.
Holding an arrow key rapidly scrubs while playback remains synchronized.
Shift plus an arrow provides faster navigation.

v14 · Responsive viewport

Reworked the main layout to fill the available viewport without creating an excessively tall visualizer.
Improved sizing across wide desktop displays.

v13 · Visualization sizing

Introduced viewport-aware stage height so playback and camera controls remained reachable.

v12 · Shared views and colours

Added privacy-first shared-view links that store settings and camera position without uploading audio.
Added customizable left, centre, and right stereo colours.

v11 · Core Sound Field visualizer

Established the browser-based 3D song map, local audio analysis, playback controls, camera presets, loudness scaling, and stereo/density views.