[itsme]

CSV files have to match the PDF. Scans might be different. Alas we cannot share the matching PDF together with a CSV due to copyright rules.

To remove the wrongly imported songs filter by filename: 
on the "Songs" tab open the dropdown next to "Search:" and select "File Paths"
type a relevant part of the filename into the search field until all songs from your "Real Vocal Book" file (and only those) are shown
rightclick one of them, click "Select All" (the empty checkbox in the small multi-selection box that shows up bottom right)
click "Delete Song"
check "Delete Song Pdf/Image/Text Files" to remove not only the songs from your library but also the file

To adapt the downloaded CSV file to your PDF:
open the CSV in LibreOffice Calc (my favourite, there are other programs out there you could use)
use a formula to apply +1 or -1 to the page numbers
use CSV import again

or use https://www.zubersoft.com/mobilesheets/f...-8374.html