If you still wish to attempt using GravityBox or its modern equivalents on Android 13: using Magisk. Enable Zygisk in Magisk settings. Install the LSPosed module (Zygisk version) and reboot.
. There is no official "GravityBox for Android 13" release from the original developer, C3C076. Current Status for Android 13 Official Support : The last official version was GravityBox [R] for Android 11. Compatibility Issues gravitybox android 13 free
: Unlink notification and ringtone volumes, and use volume keys to skip music tracks. How to Install on Android 13 If you still wish to attempt using GravityBox
Keep in mind that customizing Android 13 using third-party tools like GravityBox, LSPosed, or Xposed Framework may come with some risks and limitations: gravitybox android 13 free