Along with all of the good advice already given, you have the option to turn off the BIAB generated endings and make your own (as explained in previous post above and in the videos you've been directed to). You can do this globally (for all songs) or for each song.
If you use real tracks, you can have 4 bar BIAB generated endings. That adds another wrinkle.
I agree with the other posters - usually the BIAB endings are great when coupled with the correct style for the song you have made, with an occasional 'what was that?' thrown in just to keep you on your toes.
When you figure out the endings and are happy with the way one sounds you can freeze the song to preserve it exactly as it has been generated. If you click the regenerate and play button without freezing BIAB will come up with something else most of the time and that may or may not be what you are looking for. Basically it comes down to a lot of experimentation and tweaking of the song.
Of course there is always the option of making your own ending (by turning off the BIAB generated one as mentioned above) and that again involves more trial and error and being familiar with how BIAB works and what it can do. I would say that for me I use about 90% of what BIAB generates and the rest I program in, sometimes porting to RealBand for the final mix.
It really is a two edged sword situation with BIAB / RB - very simple if you want it to be and very complex if you choose to put in the time to learn it. And don't be intimidated by it. Everyone on this forum and those that use BIAB that don't come here started from scratch (including a lot of head scratching) to eventually reach whatever level of knowledge we all have of BIAB. Hang around here and you will quickly figure out who are the real pros (and that is certainly not me), but you will always be welcome and have your questions answered.
Good luck with your song making and have fun. Oh, and get really familiar with the Save and Save As buttons...

Edit: One of those pros is Mac, that posted above while I was typing. Never miss one of his post.

Last edited by BarryKJ; 03/14/14 08:07 AM.