No 4 bar limit in RB .. and Realband is included with BiaB.

If you like working in a more linear style and having more control like this you may want to try opening the BiaB song in RB, then use the right-click-Track menu to 'Make all BB tracks regular tracks'.

That way you have your song preserved as it was and can do more complex editing and generating (etc).

It's more powerful than BiaB in many ways, but not quite as fast at some stuff, like regenerating all the tracks for a whole song..

I do not work here, but the benefits are still awesome
Make your sound your own!