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NOTE: This app is no longer maintained.
The app displays two rows of keys, one for each octave, occupying the whole screen. You can access the menu by pressing volume up and volume down keys simultaneously.
KnownVuln: This APK has a known security vulnerability, found by one of the scanners in _fdroidserver_. The most common case is a broken signature algorithm or using a vulnerable version of OpenSSL.
DisabledAlgorithm: This APK was signed using a signature algorithm that was disabled because it is broken.