A small control. A whole world of music.
Tap the floating control to expand it. Collapse it when you pause to keep the game in view.
Made for harmonica moments in Delta Force
v1.6 · Community scores are hereYour favorite melodies,
in your next game.
Let YuChen help with the music.
Pick a song. Enjoy the moment it starts.
Android 11+ · ARM64 · 11.2 MB
See it playing inside the game
Real in-game screenshots / 01 / 05Playback bar · Play and pause without losing your view
Ready to play
Floating controls keep the game in view
0.5× — 5.0×
Find a tempo that feels right
MIDI / TXT
Bring your own scores, too
01 / Find your next song
Your next favorite song
could be in the community.
Open the public score community, find a song, and download it into your own library.
- Search with what you remember
- Search by title, composer, uploader, or tags.
- Know the song before you play
- See the BPM, duration, and note count at a glance.
- Keep scores on your device
- Use the same score in the harmonica simulator or in the game.
Open Public Score Community inside the app to get started.
02 / Play at your own pace
Keep the music close.
Keep the game in view.
Play, pause, choose a score, or change tempo
without switching between apps.
03 / Play your first song
Grab your phone.
Get started in three steps.
- 01
Install the app
Open the APK on your phone and follow the Android installation prompts.
Get the APK - 02
Enable accessibility
Enable the YuChen accessibility service in Android Settings, then return to the app and start the floating controls.
- 03
Open the harmonica and play
Keep the in-game harmonica visible. Locate the keys, choose a score, and tap Play.
If Android blocks accessibility, check App info to see whether restricted settings need to be allowed.
A little more to know
A few common questions.
Will it work on my phone?
Requires Android 11 (API 30) or later on an ARM64 device. iPhone and 32-bit Android are not supported. In-game playback requires accessibility and a visible harmonica screen.
Is root required? Why accessibility?
Root is not required. YuChen uses Android accessibility screenshots and gestures to locate and play the keys. Return to the harmonica screen and locate the keys again if positioning is lost.
How do I get or import scores?
Open Public Score Community inside the app to search and download public scores. Import .mid, .midi, or supported score-format .txt files. Plain lyrics and MP3 files cannot be imported directly. Scores are stored locally; uninstalling or clearing app data removes the library.
Do I need an internet connection?
Screen recognition, local scores, and playback run on your device. Browsing or downloading community scores requires internet access. The game has its own network requirements.
Your music is ready