# Music Box Retro Go — 6 Classics, Zero Data

> 6 Classics, Zero Data (iPhone/iPad app by 晓 郭.)

- Source: https://appshunter.io/ios/app/music-box-retro-go/id6771277053 (this page in markdown: same URL + `.md`)
- Developer: [晓 郭](https://appshunter.io/developer/1895645928)
- Category: Music
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-05-21
- Data updated: 2026-06-04
- User reviews in markdown: https://appshunter.io/ios/app/music-box-retro-go/id6771277053/reviews.md

## What is Music Box Retro Go?

Music Box Retro is a precision-crafted virtual music box built with AVAudioEngine bell-tone synthesis, delivering authentic plucked-string timbre for 6 classic melodies.

TECHNICAL HIGHLIGHTS
- Custom AVAudioSourceNode renders each note as a sine wave with harmonic overtone (12% third harmonic) and exponential amplitude decay — matching the acoustic signature of a real music box
- 6 MIDI-encoded melodies: Twinkle Twinkle, Ode to Joy, Brahms Lullaby, Canon in D motif, Fur Elise motif, Sakura
- Progressive unlock system: melodies unlock at 3, 8, 15, 25, and 40 total play counts
- Playback speed: 0.5x to 2.0x in 0.1x increments
- UIFeedbackGenerator haptics synchronized per-note
- AppStorage-backed persistence for play count and selected melody
- Portrait orientation only
- Forced dark color scheme

PRIVACY AND DATA
Music Box Retro operates entirely on-device. No network requests, no analytics, no crash reporting, no third-party SDKs. Zero data collected or transmitted.


## Version history (last 1 release)

### 1.0 — 2026-05-21

No release notes.

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All apps by 晓 郭: https://appshunter.io/developer/1895645928

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*