I use my Elektron Octatrack as my external drum machine as modular drums would easily cost me 5x. That said, the BIA is tons of fun and can do a lot more than just drums which is why I love mine especially paired with the NE Cursus Iteritas. I recommend Kinks and Links. I use these utility support modules all the time in patches so useful. Attentuators/mixers are key as well to create submixes and route options. I need to add more to my setup- MI Shades is perfect for this sort of thing. On my list for the holidays.