Logic Pro X - Drum & Bass line

Hi,
I try to do a file .midi with Logic Pro X.
I’ve 2 tracks, Drum & Bass but when I export on Midi, I’ve only a Drum.
How to do?
Thank you for you help.

Have a bit of a read through this thread. Its with a different program but steps should be the same

http://mybeatbuddy.com/forum/index.php?threads/create-your-own-songs-for-dummies-with-bass.4901/