If you have the same song made in Biab, you can save that as a file in Biab. It should look something like this mysongname.mgx or mysongname.mgu

Realband will load that song, along with any tracks and the chords. You can delete the tracks, midi or real and import your files from the recorder.

You could also try using edit-copy from in Biab, while having Realband open and loaded with the same song at the same time and then use Edit-paste in Realband. Make sure you have the cursor on bar 1 when pasting.

I believe you can copy the chords only using the Edit-Copy From Thru method from Biab. Select the box that has chords only and de-select the other boxes. Otherwise, it will paste bar settings and other stuff that you don't need.

Or

Load a blank 4/4 style on your Biab song, save it as midi, open in Realband and then import your files from recorder.

Trax