There were comments that the processor/ polyphony performance had glitches, I never experienced this on my Integra7. I midi from my G70 and played styles using the selected SN-A sounds, and they played properly. I don't believe the BK9 allows you to use any of the 22 SN sounds in anything but real time parts (No styles or SMF).

When I midi from G70 to I7 , styles use 8 parts, the SMF used 16 parts, without any noticeable issues.
Maybe the issues reported were PC problems associated with Integra7.