I use BIAB to export loops to my RC50 looper. The issue I have is with timing of the loop so it coincides with the built in click (which is what goes to my drummer's monitor). One easy solution is to use the "soundtrack window" to export a loop of a specific length. You can set the length of the segment on the main screen (start and end measures). Of course, you'll need to do some math ( #measures x beats per measure / beats per minute).

Lately, I have used an external editor (Cubase Lite) to just trim the parts and import them into specific loop channels ( I usually export the individual files so I can edit each). Exporting the entire song and splicing gives more of a seamless transition between song sections. Otherwise, just exporting segments you sometimes get some sort of odd drum or piano lick at the end of a section that conflicts with the beginning of the next loop.

Hope this helps somewhat.

FC