# Tetratonics: The 4th Dimension — Four Notes. Infinite Color. > Four Notes. Infinite Color. (iPhone/iPad app by Oliver Richard Erich Naumann.) - Source: https://appshunter.io/ios/app/tetratonics-the-4th-dimension/id6759824577 (this page in markdown: same URL + `.md`) - Developer: [Oliver Richard Erich Naumann](https://appshunter.io/developer/1790724923) - Category: Music, Education - Price: $0.99 - Age rating: 4+ - Requires: iOS 17.0 · 143 MB - Languages: American English - Released: 2026-03-04 - Data updated: 2026-08-25 - User reviews in markdown: https://appshunter.io/ios/app/tetratonics-the-4th-dimension/id6759824577/reviews.md ## What is Tetratonics? Tetratonics - The 4th Dimension Four Notes. Infinite color. Step into the 4th dimension of modern jazz harmony. Tetratonics reveals the secret behind modern jazz voicings: take a major or minor triad you already know, add one carefully chosen color tone, and superimpose the resulting 4-note tetratonic structure over any chord. The result is immediate - beautiful, sophisticated harmony within reach. The ultimate harmonic laboratory for improvisers, composers, and arrangers, bridging the gap between abstract theory and concrete sound. --- THE CORE SYSTEM: 10 CURATED STRUCTURES Tetratonics curates the 10 highest-value "Triad + 1" combinations used in contemporary jazz: - 6 Major-Based: (b2), (2), (#2), (4), (#4), (b6) - 4 Minor-Based: -(b2), -(2), -(4), -(#4) Optimized for harmonic beauty and functionality, every combination sounds incredible. --- THE SOUND STUDIO [NEW IN 2.0] Tetratonics is no longer just a visualizer - it's a premium, high-fidelity auditioning space. Rebuilt on a zero-latency audio engine, our glassmorphic Sound Studio lets you play and mix voicings across two independent layers. Assign 17 gain-staged instruments (8 chord pads, 9 melodic leads) with perfect perceived-loudness parity - no volume adjustments needed when switching timbres. --- CONTEXT-AWARE AUDIO ENGINE [NEW IN 2.0] Our Harmonic Intelligence engine dynamically adapts underlying chord voicings to match your chosen scale perfectly. - 6 Voicings: Root Position, Open I (Drop 2), Open II (Drop 3), Tetratonic (upper structures), Shell (Root + 7th), or Root Only. - Articulation: Select Strum Up, Strum Down, or Block. Adjust strum speed, note spacing (Loose-to-Tight), and choose from 4 velocity contours (Flat, Rise, Fall, Accent Root). - Custom Sequencer: Drag-and-drop to reorder scale pitches into custom melodic licks, or apply 7 geometric arpeggio patterns like "Arc" or "Pendulum." --- THE HARMONIC VISUALIZER Our stunning visualizer maps exactly how your chosen tetratonic structure relates to your underlying chord on a 12-tone chromatic ring: - See the tetratonic pitches form a unique geometric shape reflecting precise intervallic relationships. - Notes are color-coded by harmonic function: Core Tones (blue), Sevenths (green), Natural Extensions (amber), and Altered Tensions (crimson). - Tap any note for an instant preview, or pivot your starting point with a tap. --- FLAWLESS ENHARMONIC CALCULATION Drop a Triad + 1 structure over any chord and our analytical engine decodes the result. The app distinguishes between complex contextual choices (knowing when an interval functions as a b5 vs a #11, or b13 vs a #5) and outputs the perfect, standard-compliant jazz chord symbol (e.g., Cmaj7(9/#11), G7(alt)). The intelligent scale builder respects the enharmonic gravity of your chord - over flat roots, you see flats; over sharp roots, you see sharps. Every pitch is spelled correctly. --- THE CONTROL ISLAND & FAVORITES A tactile interface designed for quick adjustments. Rapidly switch between the 10 master archetypes and see your tetratonic formula. When you stumble upon a killer voicing, tap the star icon to save it, and instantly preview or audition it directly from your Favorites library with a single tap. --- DESIGNED FOR MUSICIANS, BY MUSICIANS Built to feel like a high-end piece of gear: - Adaptive Layout: Shifts perfectly between portrait reference and landscape practice modes. - Premium Dark Mode: A "liquid glass" aesthetic that preserves your vision on lit stages. - Haptic Touch: Tuned tactile haptics sync perfectly with note triggers to make the screen feel like a physical instrument. - Pro-Audio Resilience: Rebuilt on a robust signal chain that gracefully handles interruptions (calls, Siri) and headphone changes without dropping a beat. - Strictly Offline: Zero ads, zero subscriptions, zero data collection. Runs entirely locally on your device. Discover a lifetime of modern harmonic color with Tetratonics today. ## Version history (last 5 releases) ### 2.1.1 — 2026-05-18 WELCOME TO THE FOURTH DIMENSION: TETRATONICS 2.0 IS LIVE! What was once a silent visual calculator is now a high-fidelity, playable, tactile instrument. Version 2.0 transforms Tetratonics into a professional, zero-latency harmonic laboratory. We have rebuilt the entire app from the ground up around a dual-sampler AVAudioEngine to let you play, layer, and orchestrate modern jazz harmony in real time. Here is the complete, high-fidelity breakdown of everything new in Version 2.0: --- THE SOUND STUDIO --- Step into a glassmorphic control room. Rebuilt as a unified three-tab panel, the Sound Studio lets you sculpt every detail of how your harmony is arranged and performed: - TETRATONIC TAB (Melody): Sculpt the upper structures. Drag-and-drop to reorder scale pitches into custom licks, apply 7 geometric arpeggio patterns (Ascending, Descending, Pendulum, Arc, Resolve Up, Resolve Down, Block), and slide note timing from driving to loose. - CHORD TAB (Harmony): Voiced with 8 gorgeous pads. Select from 6 classic voicings, 3 articulation styles, and 4 velocity contours visualized as live sparklines. - MIX TAB: Independently balance the volume of the chord and tetratonic layers from 0% to 100% of your device's full dynamic range. --- 17 CURATED, CALIBRATED INSTRUMENTS --- No more flat, dry synthesizer tones. Tetratonics 2.0 features 17 studio-grade, gain-staged instruments divided across two independent layers: - 8 CHORD TIMBRES: Rhodes (vintage warmth), Strings (orchestral swell), Synth Pad (ethereal stereo), Vibraphone (metallic bell), Guitar (acoustic pluck), Grand Piano (acoustic benchmark), Perc Organ (classic organ click), and Warm Pad (analog sweep). - 9 MELODIC TIMBRES: Celesta (crystalline attack), Marimba (wooden resonance), Flute (woodwind breeze), Music Box (delicate chime), E. Piano (percussive bite), Harp (sweeping classical pluck), Clavinet (funk-infused bite), Vocal Lead (wordless swell), and Square Lead (digital retro). - PRO LOUDNESS PARITY: Every instrument is individually calibrated across three axes (velocity, sampler gain, and output dynamic ceiling). You can switch from a punchy Clavinet to a breathy Flute with zero perceived volume jumps. --- JAZZ VOICINGS & SHIELDED ENHARMONICS --- Our Harmonic Intelligence engine actively listens to your choices, dynamically restructuring the accompaniment to support your scale: - 6 PROFESSIONAL VOICINGS: Stack them closely in Root Position, spread them using Open Position I (Drop 2) and Open Position II (Drop 3), frame them with Root + 7th (Shell), anchor the bass with Root Only, or play our bespoke "Tetratonic" voicing, which seamlessly fuses the chord's core skeleton with your scale notes voiced as a cohesive upper structure. - THE THEORY DONE FOR YOU: Drop any four-note scale over any chord and watch our engine resolve enharmonic ambiguities (knowing b5 vs #11, b13 vs #5). The scale builder respects key signature gravity (flat roots use flats; sharp roots use sharps) to present flawlessly spelled chord symbols like Cmaj7(9/#11) and G7(alt). --- THE INTERACTIVE HARMONIC DIAMOND --- Our 12-tone chromatic visualizer is now a fully interactive instrument. Notes are color-coded by chord function: Core Tones (blue), Guide Tones (green), Extensions (amber), and Altered Tensions (crimson). Tap any note on the outer ring for an instant, haptic-synced audio preview, or tap the center to trigger the full, combined performance. --- STAGE-READY PRO-AUDIO RESILIENCE --- Built for the gigging musician: - ADAPTIVE INTERFACE: Seamlessly rotates between portrait pocket reference and landscape practice layout. - LIQUID GLASS DARK MODE: Sleek, high-contrast aesthetic designed for lit stages. - AUDIO RESILIENCE: Gracefully survives phone calls, backgrounding, notification alerts, and hardware changes (AirPods unplugs, Bluetooth device switches) without clicks or dropouts. - STRICTLY OFFLINE: Zero ads, zero subscriptions, zero tracking. ### 2.1 — 2026-05-18 Version 2 — Sound Studio & Full Audio Engine Tetratonics is now a playable instrument. • Sound Studio — A new three-tab panel for shaping your sound: Tetratonic (melody), Chord (harmony), and Mix. Everything in one place. • 17 Curated Instruments — Choose from 8 chord timbres (Rhodes, Strings, Synth Pad, Vibraphone, Guitar, Grand Piano, Perc Organ, Warm Pad) and 9 melodic timbres (Celesta, Marimba, Flute, Music Box, E. Piano, Harp, Clavinet, Vocal Lead, Square Lead). Each is individually calibrated for loudness parity — switching instruments never requires touching the volume. • 6 Chord Voicings — Root Position, Open Position I (Drop 2), Open Position II (Drop 3), Tetratonic (root + guide tones + your scale notes voiced above), Root + 7th (shell), and Root Only. • 3 Articulations — Strum Up, Strum Down, and Block, with a variable strum speed slider. • 4 Velocity Contours — Flat, Rise, Fall, and Accent Root, each visualised as a sparkline in the UI. • 7 Playback Patterns — Ascending, Descending, Pendulum, Arc, Resolve Up, Resolve Down, and Block. • Custom Sequence Ordering — Drag the four tetratonic notes into any order. Any pattern applies on top of your custom base. • Independent Mix — Separate chord and tetratonic volume sliders. • Harmonic Diamond — A live 12-tone chromatic ring color-coding every note by harmonic function: core (blue), guide tones (green), natural extensions (amber), altered tensions (crimson). • Starting Point Chips — See all valid scale starting points, color-coded by interval function, sorted by harmonic tension. • Favorites — Save combinations, group by chord type / tetratonic type / date, preview with one tap. • Session Resilience — Survives phone calls, headphone unplugs, and Bluetooth device changes without audio artifacts. ### 2.0 — 2026-05-13 Welcome to Tetratonics 2.0 — our biggest update ever. We've bridged the gap between mathematical abstraction and sensory intuition, transforming Tetratonics into a premium harmonic auditioning studio. What’s New in 2.0: The Sound Studio: A brand-new glassmorphic command center to control everything you hear. High-Fidelity Audio Engine: Featuring 10 meticulously curated instruments (5 for harmony, 5 for melody) with a proprietary normalization system so every patch sounds perfectly balanced. Context-Aware Voicings: The app now acts as your intelligent accompanist. When you select a tetratonic scale, the underlying chord automatically adjusts its voicing (e.g., dynamically adding a #5) to match perfectly. Professional Articulations: Sculpt your sound with Root Position, Drop 2, Drop 3, or Shell voicings. Adjust strum speed, velocity contours, and rhythmic "feel." Custom Sequencing: Build melodic licks by dragging the 4 scale notes into any order, or use 7 built-in mathematical gestures like "Arc" and "Pendulum." Tactile Feedback: Targeted waveform animations and high-fidelity haptics close the sensory loop. Discover a lifetime of harmonic color, now in vivid high-fidelity audio. If you enjoy the update, leaving a review helps immensely! ### 1.1 — 2026-03-12 New App Previews ### 1.0 — 2026-03-04 No release notes. ## More apps by Oliver Richard Erich Naumann - [Hexatonics - Triad Pairs To Go](https://appshunter.io/ios/app/hexatonics-triad-pairs-to-go/id6740587509) - [Pentatonics - Take Five](https://appshunter.io/ios/app/pentatonics-take-five/id6746047183) All apps by Oliver Richard Erich Naumann: https://appshunter.io/developer/1790724923 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*