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Open Settings in C90 (the slider icon, top right) and tap Connect Apple Music, or press PLAY in Music app mode. If you tapped "Don't Allow" before, go to your iPhone's Settings → C90 and switch on Media & Apple Music.

Press EJECT. Your shelf of tapes slides up: tap any playlist or album. Tap outside the shelf, or swipe it down, to keep the tape you have.

Tap ▶▶ for the next song and ◀◀ for the start of the song (tap again for the previous one). Hold either key to fast-forward or rewind. Tap the cassette to see its tracklist and jump to any song.

Use Any app mode: start the music in that app, come back to C90 and the reels turn while it plays. iPhone apps can't read another app's song title, so you write the label yourself. For the full experience with your own songs, download them (for example your Suno MP3s) and open them in C90, or use + Add files on the shelf in My files mode.

It fills one 45-minute side with songs you've starred in Apple Music and songs you play most, without repeating an artist twice in a row. It uses simple rules on your phone, not an online service.

Turn on Keep screen on and Night deck in Settings. Night deck turns everything black except a dimmed cassette (black pixels use no power on OLED screens), lowers brightness and redraws less often. For long sessions, keep the phone on its charger.

Open Settings → Restore purchase, signed in with the same Apple Account. Family members in your Family Sharing group get it too.

Purchases are handled by Apple: request a refund at reportaproblem.apple.com.