Bellows - Hinge Accordion

Hold your foldable iPhone like a book, and opening and closing it becomes the bellows of an instrument. Your fingers pick the notes; the bellows decide how loud — exactly how a real accordion works.

PUSH AND PULL, DIFFERENT NOTES
• Close = push (red), open = pull (blue)
• The bandoneon and harmonica play different notes depending on the bellows direction — driven by the hinge itself, not an on-screen switch
• Fully stretched? Close to turn. Fully squeezed? Open to turn. Where you turn the bellows is the whole art

FIVE BELLOWS INSTRUMENTS
• Accordion: keys on the right, bass and chord buttons on the left (with the shimmer of three musette reeds)
• Bandoneon: different notes on push and pull (a simplified, beginner-friendly layout)
• Harmonica: close to blow, open to draw. Slide your finger toward the fold to bend
• Melodica: two octaves across both pages
• Shō: the ten "aitake" chords of Japanese gagaku. Same sound breathing in or out, with a soft dip as the breath turns — exactly what happens when you turn the bellows. The reeds start cold and wobbly and clear up as you pump

A BARREL ORGAN ANYONE CAN PLAY
• The song moves only while you pump
• Run low on air and the tempo and pitch sag, like the real thing
• A punched paper roll flows across the fold. Close it at the end for the finale

GUIDE SONGS
• The next key lights up, with the bellows direction and where to turn
• Furusato, Sakura Sakura, Twinkle Twinkle, Ode to Joy, Frog Round, Jingle Bells, plus an original tango, blues and shō études
• Scoring looks at only three things: keys, direction, and air. Never speed

LITTLE INSTRUMENTS
• Hyoshigi clappers: the night-watch call "Hi no yōjin", ceremonial claps, and the kabuki "ki". Close to strike on the call
• Clip-clop: how fast you flap sets the horse's gait, from walk to gallop, on dirt, cobbles, a wooden bridge or snow
• Slide whistle: the opening angle is the pitch, with siren and slide-down gags

GENTLE ON THE HINGE
• Moving between 65° and 170° is plenty — no need to close it all the way
• Faster or harder never makes it louder
• Past a daily guide (150 round trips, 30 full closes) the app suggests Finger Bellows (you can turn this off)

ON OTHER IPHONES
• Rub the bellows in the middle of the screen to play, or tap Auto Air

SOUND
• Everything is synthesized on device — no recordings
• Plays with the silent switch on and mixes with music from other apps
• Haptics give back the buzz of the reeds (can be turned off)

PRICING
• Every instrument and song is free
• Ads appear only at the bottom of the instrument list — never while playing, on the outer screen, or in the tutorial
• A one-time "Remove Ads" purchase removes them

NO ACCOUNT
• No sign-up. Settings stay on this device

Terms of Use: https://nayukitecture.com/works/duo-bellows-terms-of-use.html