Song Viewer: Content Window: Transpose
This section allows you to transpose1) your chord lines from a displayed song file.
This function will only affect chord lines and does not work, if your file is not formatted correctly.
With the buttons 
and 
you can transpose all chords a semitone down or up.
In initial configuration, sharps will be used. If you want to use flats instead, check the 
checkbox before you transpose.
1)
This form of transposition is musically not correct, because it does not use scales and keys and therefor does not know if sharps or flats have to be used. But it can help you anyway.