This keyboard is for typing Cipher music notation (where numbers represent notes).
The Cipher music notation is used throughout Indonesia and China for all kinds of music. The keyboard is not intended for general orthographic use, although it is usable for song lyrics in simple Roman writing systems. This solution is primarily intended for fairly straightforward songbooks for singers, not for complex instrumental music. It can handle harmony lines fine, but not a lot of intricacies or subtleties (e.g. no staccato).
This keyboard and the Doulos SIL Cipher font (which will be installed with this keyboard) work best with applications using the Graphite rendering technology, such as LibreOffice.
The default for this keyboard is to type Indonesian cipher (kepatihan) where overlines are used. If you wish to use Chinese cipher (jianpu) that is also possible with this keyboard. Use one or the other of these options. Do not turn jianpu on with Keyman configuration and off with the RALT hotkeys.