Also remember that your midi source will be playing just the active kit in your B.B. Your midi controller will be capable of playing many notes thst are not mapped to anything in the B.B. So, it’s a real good idea to open up the BB drum kit in the drum kit editor window in the B.B. so that you know which midi notes are mapped to which drum tones.
What I do is to have a “blank” song loaded on the B.B. This consists of a B.B. song that just has a Null loop entered as its main loop. That way if it does accidentally get started, it still won’t play a track. Then just select the drum kit you want and your midi controller can play that kit, assuming you have the B.B settings all correct. You need to have midi in notes enabled.