What kind of exercises do I do next to BE?

All the exercises you like. Personally I play a lot of lipslurs and flexibilities. I do a lot of first attacks (play a note, take the mpc off and set it up again and play a note etc). These things work as integration exercises.Just because you can focus on the feeling of every note the new things can gradually sink in and become part of the playing chops. Of course play some music you like, just to make some fun and try your new chops. In the end the only goal is to make music as easy and beautiful as possible.