Thanks everyone for the very kind comments.
Although not a happy subject, it was still fun creating the song.
Guenter: indeed, we filmed it ourselves.

Josie:
Using usertracks is actually a matter of (endless) trying out of all the available usertracks in the usertracks section of the forum.
Within the Realtracks folder of BiaB there is a separate Usertracks folder.
First: rename that folder to Usertracks 1.
Create a new folder called: Usertracks.
Put all the new downloaded (unzipped) Usertracks in that folder.
Next, start BiaB, quickly create a song with the melodist.
Load a usertrack on every channel, press 'generate and play'.
As soon as the song start playing, set every individual track to solo and listen to the individual track.

Write down the UTs you like, keep them and throw the others away from your own created UT folder.
Finally, cut all the UTs you want to keep an paste them in the Usertracks 1 folder.
After that delete the 'empty' Usertracks folder and rename the Usertracks 1 folder to Usertracks.
Kind of a workaround, but actually this is the fastest way to process lots of UTs.

We are Rob Meulman and Anne-Marie Bovenkamp from The Netherlands.

https://www.youtube.com/channel/UC1gsdNLE7_Gy8qavoOplQow/videos
http://rnam.net/