I'm looking at the Tone List, it says BK-9 has 1718 Tones including the 22 Supernatural sounds. The number 1718, is matching the specification sheet for the number of tones.

But, why does the spec. sheet saying that there are 77 drum kits when the list goes from 1720 to 1814, if you do the math...

1814 - 1719 = 95

4 out of these 95 are dedicated to the keyboard real-time parts (KBU1, KBU2, KBU3, KBU4) and 1 dedicated to a Rhythm or Song (RSU1) which is a total of 5 user drum kits

So 95 - 5 = 90, still not 77.

What's up with these extra 13 drum kits, why the spec list doesn't match the reality ?