Foldeon help

How do I make a sound?

Hold a key with your thumb, then move the bellows. A key on its own is silent, exactly like on a real accordion — the sound comes from the air.

• Any iPhone: hold the phone in landscape with both hands and tilt it toward you and away from you.
• iPhone Duo: hold the two halves like the ends of an accordion and fold and unfold the phone. You never need to snap it fully shut.
• On screen: drag the bellows strip in the middle up and down. You can choose this in Settings → Play the bellows with.

Why does the same key play two different notes?

Because Foldeon is a diatonic (bisonoric) accordion: each key has one note when the bellows open (pull) and another when they close (push). The big letter on a key is the note for the direction you are moving now; the small one below is the other direction. The button chart lists every key of every instrument.

The sound is too quiet, or starts too easily

Open Settings and move the Sensitivity slider: higher gives full sound from gentler movement. If it still feels wrong, tap “Recalibrate the Bellows” and move the way you actually play during the warm-up.

I hear nothing at all

• Make sure the bellows are moving while you hold a key — stopping stops the sound.
• Turn the volume up. Foldeon plays even with the silent switch on, like any instrument.
• If you use Bluetooth headphones, there is a small delay; wired headphones or the speaker respond faster.

Can I change the note names?

Yes: Settings → Note names. Choose C D E, Do Re Mi, or German names where B is B-flat and H is B-natural. Foldeon starts with the tradition of your language.

How do the videos work?

Tap the red record button, play for up to a minute, and tap it again. Foldeon makes a vertical video of an accordion whose bellows move the way yours did, with the pressed keys lit and the notes shown on top. Share it straight to TikTok, Instagram or Messages, or save it to Photos. Videos made without Pro carry a small “Played on Foldeon” mark.

I bought Pro on another device

Open Settings → Restore Purchases, signed in with the same Apple Account. Pro is a one-time purchase, not a subscription.