Aurora · StarBoard app 2 · Prototype 0.5.0

Chords and arpeggios, lit from the root

Help me — how to use this

Every chord is a curtain of light: its notes stacked in thirds, brightest at the root. See the shapes a hand can hold and the paths a pick can sweep, hear each one, and retune any string — they move with you.

Instrument
Root
Quality
Extension
Note labels
Note spelling
Quick tuning

Observatory · Instrument setup

Open-string tuning

Shown low string → high string. Use − / + to move any string one semitone. Every voicing below is recomputed from these pitches.

Key

Chords that work in your key

Key

In the keyStacked from the scale. The line under each chord is its character; hover for why. Click one to chart it.
Colour from outside the keyBorrowed chords and secondary dominants — the usual ways to step out for a bar and come back.
Progressions in this keyStock changes, spelled out in your key. Click one to load it into the progression builder below.

Charted chord

Chord

Chord tones Root, third and fifth each carry their own colour everywhere they appear. Extensions sit back. Click a tone to hear it.
Scales that hold this chordScales rooted on the chord's root that contain every chord tone. Open the mode or scale in Constellation to expand on it.
Root Third Fifth Extension · 6th, 7th, 9th, 11th, 13th Note in the focused voicing Open string · before the nut
Voicings
Spread
Fret focus Light chord tones only between these frets. Voicings are still found on the whole neck.
From
To
Frets to chart How many frets the neck shows. “All” voicings and arpeggio shapes search everything charted.
Strings shown Click a string to hide it. Hidden strings go dark on the neck, and voicings and arpeggio shapes use only the strings left showing. The string labels on the neck toggle too.
Sound With sound on, clicking a note on the neck plays it. Play, strum and arpeggio buttons always sound.
Charted maps Six saved snapshots — instrument, tuning, capo, chord, voicing, view. ⤓ saves what is on screen into a slot; click a name to recall it; double-click a name to rename; × empties the slot.

Arpeggio Maker 6000

Arpeggio shapes

Shape
Chart export Save a colour PDF: the neck as it is now, every voicing shown (Common or All), and the arpeggio shapes.

Reverse lookup

Name what you're holding

Turn on picking, click any positions on the neck — the notes you would be holding — and Aurora names the chord. Every name that fits is listed, closest first.

Progression

Voice leading

BPM

Line up chords and Aurora picks, for each one, the voicing that moves the fewest fingers from the one before. Pin a chord's voicing by focusing it before you add it. Click a step to load that chord.

Observer’s notes

What this prototype proves

Nothing here is a stored chart. Every voicing and every arpeggio shape is found by asking the current tuning which notes spell the chord and which of those a hand can actually hold or a pick can actually reach. Retune a string, move the capo, pick up a banjo — and it is all found again from scratch.

Aurora remembers your last session in this browser: instrument, tuning, chord, voicing mode and view.