We can add the assignable D beam to the list...
When I use the Prelude (with the band)...I have the drum roll on the D beam and when you release the D beam it has a kick drum and crash...very much an attention grabber...I really wish I had this on my G70 D beam option...but NO, I have to use a drum kit and play the roll and crash manually
If this option is on the BK9..it is another positive..