Importing a .STY file, or a zipped directory containing them anywhere will have them copied to the Styles folder, which is private to the app, and not accessible to the user. That means at this time the only way to delete a style is to uninstall the app, but this can be fixed in future. The style should be visible in the style picker, local tab, when imported. If a zipped directory containing MGU files and style files is imported, the styles will be copied to Styles, and the MGUs and their respective directories copied to the user-accessible Songs folder, again, in-app, and not visible from the Android file system.

The Key change function changes only the key signature value of the song, and the transpose will transpose all the chords entered to the new key, and change the key signature value. This may not be working in the current live build, but is fixed in the next update, which is nearing release.