attempts the conversion of lyrics file into chordii input

-r ratio
        Sets  the  threshold  for  chordii  line  recognition.  a2crd looks at every line. If the ratio (
        space_characters / (non-space_characters) is greater than ratio, the line will be recognized as a
        chordii  line,  and  its content will be merge with the next available text line. The ratio has a
        initial value of 1. It is defined as a floating precision value.