Beta 1.01

TwinFret

Write a guitar line on the blue neck. The gold neck is the twin harmony part.

Open TwinFret All tools Target Tone guide Sequence Lab guide

Start here

Leave Key on C and Interval on 3rd above unless you already know the lick’s key.
Stay in Write. Click notes on the Original (blue) neck in time order.
Watch the gold neck fill in. That is the twin, not a second lick you have to tap first.
Hit Both. Blue is panned left, gold right.
If the twin sits on an awkward string, use Twin start ▲ ▼ to pick another shape.
Space plays or stops both parts. O original only. H harmony only.

Phone shows open strings plus a 5-fret window around the lick. First tap unlocks sound.

What you are training

Two-guitar thinking. One line you wrote, one line the engine voices in-key so you can hear thirds, sixths, contrary motion, and when the parts should land together.

The two necks

Blue round dots — original notes, numbered in play order
Gold square dots — twin notes
Dashed outline — run start or end marker
White ring — selected original note

Click a numbered blue dot to select it, then click a new fret to move that note. Click a gold dot to flip the twin up an octave, down an octave, or rest it.

In depth

Write vs Run

Write is tap-to-add. Run is mark a start fret, mark an end fret, then Make run. The run style (MaidenLock, LizzyGlass, AllmanWide, and the others) chooses how the fill walks through the scale between those two points. After the run writes, you are back in Write so you can edit.

Interval

How far the twin sits from the original, in scale steps or exact semitones depending on motion. 3rd above is the Thin Lizzy / Maiden default. 6th above is the Allman wide lane. Below intervals put the twin under the melody.

Motion

LaneLock — parallel in-key. The usual harmony guitar.
SteelGap — exact semitones, not scale-aware.
SameRoad — twin moves the same direction as the original.
SplitRun — twin moves opposite.
MeetWire — lines walk toward each other.
DronePeg — twin holds a pedal.
Stack8 — octave double.
EchoFret — twin copies the original late, delay in notes.

Recipes in the same menu (LizzyGlass, AllmanWide, MaidenLock, SteelFour) set interval, string lane, and flags at once.

StringLane

LaneWire prefers 3NPS. BoxFive prefers pent boxes. HandPath takes the shortest fret travel. Twin start cycles legal starting strings so the twin can sit on a neighbor string instead of stacking on top of you.

Bars and rhythm

Each beat can be rest, 1 quarter, 2 eighths, or 4 sixteenths. That is how many lick notes the beat eats. Extra notes wait in the queue until you add bars. Click a beat to park the next write there.

Phrase jobs

Open More. Set Phrase from / to by note number, pick a job, Paint phrase. Jobs override the global motion on that span: ride with me, go wide, go the other way, meet me, hang, lay out (twin rest), or hit the same note. Clear phrases removes the overrides, not the lick.

Flags in More

Scale tones — ghost every in-key pitch on the neck
LaneSwap — let the twin change strings more freely
BoxStay — keep the twin near the current window
AutoSpread — kick tight low 3rds up an octave so they do not muddy
ChartGrab — snap twin notes toward the chord chart you type
Land together / Walk into land — cadence control on the last notes

Save and load

Save downloads a .twinfret.json lick. Load opens one. Last lick also sits in this browser. No cloud account yet.

Keys

Space both · ⌫ delete · Z undo · [ ] twin start · 0 1 2 4 set beat density.

What this beta is not

No mic. No two-player sync. No printed PDF beyond the browser print dialog. If a twin walks off the neck or a recipe voices a clash, send Murphy the key, interval, motion, and the lick file.

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