You can use this feature if:
- The index of the books are the same; the songs have the same page number in each book.
- The offset of the books are the same; the number of pages before the first song are the same in each book.
- Classic Real Book Bb - crealbk1_bb.pdf
- Classic Real Book Eb - crealbk1_eb.pdf
- Classic Real Book Bass - crealbk1_f.pdf
You must at the very least have a book named with the base book code. You can have, for example, the Classic Real Book C or concert and the Bass Clef version or the C concert version, Bb version and Eb version or any combination of them.
You need the actual book with all of the songs and all of the pages, not a single page PDF so that you can access your Bb, Eb, or Bass clef book. We had a user do this recently wondering why the feature wasn't working. If you want it to work, don't do this.