FoldTune

Open and close your iPhone Duo like real bellows and it plays like an accordion. Chords on the left, keys on the right. On any iPhone, breathe with your thumb.

Your phone folds. So does an accordion.

FoldTune turns iPhone Duo into a squeezebox. Hold it like a book, pump the hinge open and closed, and the bellows breathe: press harder and faster for a louder, brighter sound, ease off for a whisper. Bass and chord buttons sit under your left hand, piano keys under your right, just like the real thing.

PUMP THE HINGE • Opening and closing the fold is your bellows. Both directions sound, with a natural dip when you change direction • Bass notes plus major and minor chords on the left, in circle-of-fifths order • A vertical piano keyboard on the right, with octave shift

ANY IPHONE, ANY SCREEN • On the outer screen and on every other iPhone, hold the breathe bar under your thumb. Slide up to push harder • Or rock the phone to breathe • Bigger keys on the small screen, two-hand layout on the big one

TWO VOICES • Accordion: three reeds per note with that warm musette shimmer • Harmonium: darker and softer, with a drone

MADE ON YOUR PHONE • Every sound is synthesised live on your device. No samples, no downloads • No account, no ads, no tracking. We collect nothing

FREE FoldTune is free. No subscriptions, no purchases.