A Digital Audio Workstation (DAW) and music theory tool with synthesizer and live performance environment all wrapped around Euler's "Tonnetz".
The "Tonnetz" concept is much more than eye-candy: it maps harmonic relationships to physical space, allowing for the intuitive visualization and application of complex chord structures. By translating musical intervals into a two-dimensional grid, users can explore tonal gravity, voice leading, and advanced chord extensions using visual memory rather than traditional linear keyboard mapping.
The good news for those who are still unfamiliar with the "Tonnetz" concept: the app is still fully usable as a traditional DAW. In other words: the Tonnetz chart is meant to rather be a useful tool, but by no means a prerequisite to get going with this app. Just plug in your MIDI controller or use the on-screen keyboard to start creating music immediately.
Engineered as a zero-dependency vanilla JS architecture, the application operates as a fully-featured, offline-capable Digital Audio Workstation (DAW) natively in the browser, featuring full DAW interoperability and persistent local storage.
RECOMMENDED USE: no installation required; simply run directly in Firefox(!!!) browser (mobile or desktop): Tonnetz Pro Web.
Other browsers technically work and native installers are available (under "Releases"), but due to superior Web Audio API performance Firefox will still by far be the best experience.
- Hybrid Engine: No hard limit for the number of linear arranger tracks. Entire orchestra? No problem. On top, there are 8 cyclical Looper tracks (L1-L8).
- Agnostic Recording: Tracks automatically adapt to incoming data (voice/synthesizer data vs. drum machine triggers).
- Smart Track Inheritance: Recorded tracks instantly inherit the exact parameter snapshots of the active instrument (overtones, LFO, envelope states ...).
- Live Input Monitoring: Tapping the manual drum pads routes the audio directly through your actively selected mixer track, allowing you to hear track-specific FX in real-time while jamming.
- Professional Mix Bus: A full mixer featuring per-track Volume, Panning, and dual Aux Sends (Echo & Reverb). Includes DAW-standard Multi-Solo and Mute toggles (with a strict "Mute-overrides-Solo" hierarchy).
- Preset Sync & Master Bounce: Record drum presets quantized to the downbeat. Export your master output bus to downloadable WebM, MP4, MP3, or uncompressed WAV files (which directly tap the master safety clipper to guarantee the exported audio perfectly matches live playback fidelity).
- Geometric/Tracker Orientation: A vertical timeline (with pitch on the X-axis, i.e. matching the piano keyboard orientation), complementing the geometric Tonnetz and piano keyboard.
- Dynamic Time Signatures: The background grid dynamically redraws bar lines to reflect complex meters (e.g., 3/4, 5/4, 7/8) in real-time.
- Full Note Articulation: Draw, select, move, and dynamically resize the duration of individual notes using mouse or touch gestures. Supports group Marquee selection.
- Cross-Track Clipboard: Highlight note blocks and use
Ctrl+C/Ctrl+Vto seamlessly copy and paste across tracks. The clipboard features "domain safety" (preventing melodic synths from pasting onto drum tracks) and smartly anchors to the playhead or step cursor. - Smart Playhead & Step Entry: Mutually exclusive toolbars prevent editing conflicts. Hold
Shift + Clickto instantly teleport the playhead without dropping your current tool. Step Entry features both "Snapped" (rounds physical key-hold duration to the grid multiplier) and "Free" modes (advances by exact raw millisecond duration). - AI Composition Assistant: Select a key, scale and style and let the AI generate chord progressions or a complementary bassline or melody, which are then rendered as editable MIDI events to the piano roll.
- Exploded Polyphony: Chords played live on the Tonnetz are recorded and "exploded" into individual overlapping MIDI events, allowing for precise micro-editing of individual chord tones.
- Right-Side Velocity Lane: A resizable, time-synced automation lane featuring DAW-standard "lollipop" graphs. Draw sweeping curves to edit the exact impact velocities of overlapping drum hits or chord notes without visual clutter (the lane isolates and displays only the actively selected track).
- Tonal Mapping:
- Horizontal axis: every horizontal triangle edge represents a Perfect fifths
- Diagonals: all diagonals feature a full chromatic scale, but they are layed out in a way that triangle edges on ASCENDING diagonals represent minor thirds, while triangle edges on DESCENDING diagonals represent major thirds.
- Consequence: UPWARD triangle = MINOR third, DOWNWARD triangle = major triad.
- Chord Extensions:
- Use the multi-touch grid and combine with physical keyboard shortcuts (keyboard rows QWERT / ASDFG / Y(Z)XCVB), or the left-docked Performance Pads (only for touchscreens) to instantly inject complex jazz extensions (sus2, sus4, ♭5, ♯5, ♭9, ♯11, 13, ...).
- Chord shapes become second nature: All chords, not matter what the extensions are, have a distinct visual shape on the Tonnetz grid, which stays identical across all 12 keys and all pitch classes. Highlighting: Notes and triads which are an EXACT MATCH (including the pitch class) are highlighted in bright yellow; chords which match except for the pitch class of individual notes are highlighted in light blue; this way we make sure that chord inversions are still visible.
- Live Modifiers:
- Hold Shift for Voice Leading (use chord inversions to prioritize minimal movement between chords)
- Space for 'Sustain'
- L-Alt for 'Dampen'
- Tab for 'Legato' (glide).
- Scale Overlays: highlight your current scale from a vast library, including standard modes, pentatonics and exotic scales and modes.
- Dynamic Labels: Toggle node labels between absolute pitch, scale degrees, Roman numerals, or Solfege.
- Auto-Arpeggiator: Supports directional and randomized sequence arpeggiation with adjustable swing, subdivisions, and continuous looping.
- Responsive UI: Smart FAB (Floating Action Button) menu and per-panel Auto-Hide toggles maximize screen real estate on mobile devices by dynamically sliding panels off-screen during active play.
- Pre-Programmed Kits: Choose from a diverse library of styles, no matter the time signature.
- Manual Triggers: Use to play your own beat patterns or embellish the presets in real-time. Record everything into the looper or arranger.
- Auto-Embellishments: Let the drum AI automatically add fills and variations for a more "human" feel.
- Interactive Circle of Fifths: A synchronized harmonic minimap that tracks and highlights active chord structures in real-time.
- Scale Constraints: Snap-to-scale functionality locking the grid to 20+ standard modes, pentatonics, or exotic scales (e.g., Lydian Dominant, Hungarian Minor).
- Tuning Systems: Switch the engine from Equal Temperament to Just Intonation or Pythagorean Tuning for mathematically perfect, beatless ratios.
- Real-time Compositional Assistant: Visualizes musical tension and predicts functional chord resolutions on the Tonnetz grid.
- Psychoacoustic Heatmap: Colors nodes based on calculated dissonance against your active chord (Green/Yellow: Stable, consonant chord tones; Orange/Red: High tension and harsh dissonances).
- Genre-Weighted Tuning: Select Classical, Pop/Rock, or Jazz to shift mathematical interval weights (e.g., A Major 7th highlights as a tense red in Classical, but a stable green in Jazz).
- Gravity Beacons: Visualizes where unstable chords (Dom7, Dim, Sus) and Jazz Tritone substitutions want to resolve using glowing text outlines:
- Local Gravity (Cyber Blue): Isolated chord resolutions (e.g., a lone G7 targeting C).
- Sequence Gravity (Synthwave Pink): Grammatical progression endings (triggers on strong cadences like ii -> V -> I).
- Smart Harmonic Buffer: A highly optimized "leaky bucket" buffer aggregates rolled notes into single harmonic entities. It aggressively sheds passing melody lines while strictly protecting bass and root notes for pinpoint-accurate chord recognition, automatically suppressing UI clutter for single notes.
- Dual-Oscillator Synthesizer: Procedural subtractive audio engine featuring 33 pre-calibrated acoustic and analog presets.
- Chromatic Sampler Engine: Hardware-style sampler supporting custom .wav or .flac loading. Uses Regex to automatically extract root MIDI notes from filenames (e.g., Violin_C#4.wav) and maps them chromatically across the Tonnetz. Pitch-shifting algorithms strictly respect global microtonal tunings. Custom libraries are committed to the browser's IndexedDB for permanent offline use.
- Master Macro Dashboard: A floating, dynamic 8-knob interface for real-time performance tweaking. Assign any synth parameter via dropdowns. Features two-way synchronization, precise mouse-wheel scrolling, and automatically disables/grays out parameters that are acoustically inactive for
.wavsampler presets. - Master Bus & Phase Management: Protect your speakers with a built-in Master Compressor and selectable Master Limiter (Digital Brickwall or Analog soft-saturation). A global rolling micro-staggering engine prevents constructive phase interference and volume spiking on dense orchestral hits.
- Dynamics & Envelopes: Visual ADSR envelope controls and a "De-Click" micro-fade engine to prevent hardware zero-crossing pops during fast arpeggios.
- Modulation & Effects: Multi-LFO system, dedicated sub/noise oscillators, and a global effects chain (distortion, chorus, delay, convolver reverb).
- Duplex Web MIDI API: Play the internal engine using USB MIDI controllers (SLAVE), or use Tonnetz Pro as a geometric MIDI controller to drive external DAW hardware (MASTER).
- Clock Synchronization: Configurable MIDI Clock routing. Act as a Master clock to drive external gear, or slave the internal Arpeggiator and Looper to an external tempo.
- Project Export: Generates an open-source
.dawprojectarchive compatible with Bitwig Studio, Studio One, and Cubase. The export compiles high-quality WAV stems (rendered in parallel offline contexts to bake-in track-specific FX without bleeding), raw asset packaging for full sampler recovery, raw binary MIDI performance files, an XML manifest, and the embedded native JSON state. - Non-Destructive Recall: Importing a native Tonnetz
.dawprojectrestores the exact UI state, synthesizer parameters, and MIDI events. - Foreign Project Import: Uploading a
.dawprojectgenerated by an external DAW invokes an XML skimmer to extract track names, colors, and BPM, safely dropping foreign audio stems directly onto the Arranger timeline for playback.
(may be partially outdated and not always reflect that very latest updates)
Tonnetz Pro is wrapped in a native Rust backend via Tauri to provide a high-performance desktop executable.
Prerequisites:
Run in Development Mode:
npm install
npx tauri devTonnetz Pro utilizes the following open-source library, which is distributed under its respective license:
- JSZip (Dual-licensed under MIT / GPLv3) Used under the MIT License. Copyright (c) 2009-2016 Stuart Knightley, David Duponchel, Franz Buchinger, António Afonso.
- @tonejs/midi - Used for encoding and decoding binary MIDI files natively in the browser. (MIT License)
Copyright (c) 2026 Christian Suer (GitHub: cyberchriz). All rights reserved.
View Full License Terms
Permission is granted for personal, non-commercial use and execution only. No part of this software may be redistributed or used for commercial purposes without explicit written permission from the author. Modification and derivative works are permitted for personal use as local builds in accordance with the above terms, but may not be distributed or used commercially.
For commercial licensing inquiries or acquisition offers, please contact the author via GitHub.
For more details, see the full LICENSE.md file.