It’s tricky. First you need to know how to build an EXS-24 instrument. There are tutorials on that on the web. The what you do is locate the folder that contains your BB drumkit samples for that bass. On a Mac, you are going to use Find, and then enter the drumkit name, i.e. STAX 4 Part. Don’t be surprised if the folder is buried 20 folders deep someplace. Once you find that, select all the bass samples and copy them to an easy to locate location. Do not move them from the original location or you will mess up the BB drumkit. Just copy them and put them someplace your can find. Then, go about building the EXS-24 instrument by adding each sample into each note, which you will have learned how to do from the tutorial.
The alternative is to hook up your Beat Buddy as an external midi instrument in Logic Pro X. You would use the Beat Buddy midi cable, and you would need a midi interface that hooks up to your mac. Run the midi out from the Mac to the Midi in on the Beat Buddy cable. Set Logic Pro X and the Beat Buddy up to have compatible channels. Then run a stereo audio cable from the Beat Buddy Headphones out to your ins on the audio interface, just monitor the Beat Buddy from your amp/PA.