MADE FOR IPHONE DUO: Unfolded, the chord timeline spans the whole screen with a larger current chord. HALF-OPEN PRACTICE: Stand iPhone Duo half-open on a table and the screen splits at the fold. The raised half shows the chord you're playing in large type, plus the next chord and when it arrives. The flat half keeps capo, transpose, the timeline and playback within reach.

CAPO SUGGESTION: When a song is full of barre chords, Chord Finder offers the capo that turns them into open shapes you already know. One tap puts it on. CAPO AND TRANSPOSE: Change them on the main screen, even while the song plays. Chord names, shapes and key follow along; the recording itself is never changed. GUITAR CHORD SHAPES: Pause, then press and hold a chord to see open and movable grips up the neck. Variations suggests sus, added-tone and seventh chords to try instead. CHORD DEGREES: See each chord's role in the key (I, IV, vi and so on). ZOOMABLE TIMELINE: Pinch to zoom in on quick changes or out to see a whole section. MORE ACCURATE CHORDS: Changes now settle on bar lines, and major or minor keys are confirmed from the song's chords.