The Ultimate Guide to the Tune Fretboard Accompanist & Chromatic Chord Explorer
Accompanying traditional Irish music requires more than just strumming simple open chords. Backing a reel, jig, or hornpipe involves modal color, counterpoint voice-leading, dynamic rhythmic feel, and precise fingerings across open and closed positions.
The Tune Fretboard Accompanist & Melody Player was built specifically for traditional musicians, guitarists, bouzouki players, mandolinists, banjoists, and backing artists. It pairs real-time ABC sheet music notation with an interactive SVG stringed instrument fretboard, real-time MIDI synth audio, TAB generation, and a **31-Family Chromatic Movable Chord Explorer**.
Key Features at a Glance
🎸 10 Instruments & Tunings
Supports DADGAD, Standard Guitar (EADGBE), GDAD Bouzouki, FCGDAE Banjo, GDAE Mandolin/Fiddle, DGDA Nyckelharpa, CGDA Mandola, CGDAE 5-String Fiddle, and High/Low-G Ukulele.
🎹 31 Chromatic Chord Families
Explore 372 chromatic voicings across all 12 root keys: Triads, 7ths, Extended 9ths/11ths/13ths, 6ths, and Altered Dominants (7b5, 7#9, 7b13, 7#11, 7#5).
🎯 CAGED & Movable Voicing Filters
Filter voicings by position and style: Basic open chords, CAGED closed shapes, Drop-2, Drop-3, Mid-Neck, and High-Neck upper fretboard positions.
🎵 Dual Visualizer Modes
Switch between Notes Mode (tracing individual melody pitches in real time) and Display Backup Chords Mode (showing chord diagrams as backing advances).
🎼 Standard, TAB & Jazz Slash Notation
Render score notation as standard staff, instrument TAB, or Jazz Rhythm Slash notation (K: style=rhythm with zero-duration note beat slashes).
🖨️ Printable PDF Blank Fretboards
Print custom PDF sheets with blank fretboards formatted for 4, 5, or 6-string instruments to write down custom chord voicings and fingerings.
1. Supported Instruments & Tuning Systems
Whether you play DADGAD guitar, GDAD bouzouki, tenor banjo, or ukulele, the fretboard dynamically recalculates pitch positions, fretboard geometry, and octave ranges for 10 distinct instrument configurations:
| Instrument / Tuning System | Open String Tuning | Strings | Fret Range | Musical Application |
|---|---|---|---|---|
| Standard Guitar | E - A - D - G - B - E | 6 Strings | 15 Frets | Standard backing, CAGED voicings, Drop-2/Drop-3 jazz & folk chords. |
| DADGAD Guitar | D - A - D - G - A - D | 6 Strings | 15 Frets | Classic modal Celtic backing, ringing drones, and suspended chord colors. |
| GDAD Bouzouki | G - D - A - D | 4 Strings / Courses | 15 Frets | Traditional Irish bouzouki counter-melody and rhythm backing. |
| GDAE Mandolin / Tenor Banjo / Fiddle | G - D - A - E | 4 Strings | 15 Frets | Standard Irish mandolin, tenor banjo, and melody fiddle fingering. |
| FCGDAE 6-String Banjo | F - C - G - D - A - E | 6 Strings | 15 Frets | Extended-range tenor/alto banjo backing. |
| DGDA Nyckelharpa | D - G - D - A | 4 Strings | 15 Frets | Swedish keyharp tuning and Scandinavian folk melodies. |
| CGDA Mandola / Tenor Banjo / Viola | C - G - D - A | 4 Strings | 15 Frets | Alto register backing and tenor banjo standard tuning. |
| CGDAE 5-String Fiddle / Viola | C - G - D - A - E | 5 Strings | 15 Frets | Extended 5-string violin and viola melody tracking. |
| Ukulele (High-G & Low-G) | g - C - E - A / G - C - E - A | 4 Strings | 15 Frets | Standard High-G re-entrant and Low-G linear ukulele accompaniment. |
2. The 31-Family Chromatic Movable Chord Explorer
The interactive Chromatic Chord Explorer allows musicians to test and visualize 31 distinct chord families across all 12 chromatic root keys (C, C#, D, E♭, E, F, F#, G, A♭, A, B♭, B), rendering over 372 chord voicings on demand.
Chord Family Categories
🎸 Essential & Triads (9 Families)
The core building blocks for session accompaniment:
🎷 6ths & Diminished (7 Families)
Color, voice-leading, and tension resolvers:
🎹 Extended Chords (9 Families)
Lush modern and jazz-influenced harmony:
🔥 Altered Dominants (6 Families)
High-tension altered dominant voicings for resolutions and turnarounds:
Movable Voicing Filters: CAGED, Drop-2 & Drop-3
When exploring guitar voicings in Standard EADGBE tuning, you can toggle specific voicing styles:
- CAGED Shapes: Classic E-shape, A-shape, D-shape, C-shape, and G-shape closed barre chords.
- Drop-2 Voicings: Four-note closed voicings built by dropping the 2nd voice down an octave. Ideal for middle-string rhythm playing.
- Drop-3 Voicings: Wide-spread voicings with root on 6th or 5th string (such as the
classic
8-x-8-9-7-xshape for C7b5 or8-x-8-9-10-xfor C13). - Position Toggles: Filter voicings by neck position — Open/Low (frets 0-4), Mid-Neck (frets 4-8), or High-Neck (frets 7-12).
3. Dual Visualizer Modes & Score Styles
Notes Mode vs. Display Backup Chords Mode
The fretboard tool offers two real-time visualizer modes depending on whether you are practicing melody or rhythm backing:
- Notes Mode: Highlights exact pitch locations on the fretboard as notes sound in the synth player. Notes light up with color-coded intervals relative to the tune's root key.
-
Display Backup Chords Mode: Updates dynamically bar-by-bar to display the exact open or
movable chord shapes matching the ABC chord annotations (e.g.
"Am","D7","G").
Score Notation Options: Standard, TAB & Jazz Rhythm Slashes
You can customize how sheet music is displayed:
- Standard Musical Notation: Traditional stave with notes, key signatures, and chord symbols.
- Instrument TAB: Automatically renders 6-line guitar TAB or 4-line mandolin/banjo TAB directly beneath the stave.
- Jazz Rhythm Slash Notation: Switches score rendering to rhythm slash headers (
K: style=rhythm) with zero-duration note beat slashes alongside chord annotations, creating clean chord charts for backing practice.
Frequently Asked Questions (FAQ)
How does the fretboard calculate chord shapes for DADGAD and alternative tunings?
The tool uses a dual-engine architecture: it first checks a curated library of handcrafted traditional backing voicings for DADGAD, GDAD, and GDAE. If a specific chord is requested that isn't handcrafted, the algorithmic voicing engine calculates fret positions dynamically based on open string pitch semitones and interval formulas.
Can I transpose tunes to different keys on the fretboard?
Yes! You can select any key from the Key dropdown or transpose pitch intervals. The fretboard visualizer, stave notation, TAB, and audio playback all transpose simultaneously in real time.
How do I generate printable PDF blank fretboards for writing custom chords?
Click the Print Blank Fretboard Sheets button in the tool control bar. This opens a print-formatted template containing clean blank 6-string or 4-string fretboard grids ready for printing or saving as a PDF.
What audio sounds are used for playback?
Playback uses Web Audio API synthesis with soundfont instruments (Acoustic Guitar, Steel String, Accordion, Fiddle, Flute, Whistle). You can independently adjust playback BPM tempo, swing feel, melody volume, and backing chord volume.
Ready to Explore the Fretboard Accompanist?
Select any session tune or test chord family to visualize fingerings, hear audio playback, and generate TAB for 10 instruments and tunings.
Launch Tune Fretboard Accompanist