Here is the info straight from Korg:
“Regarding EXB-PCM - Boards 1 through 5 contain one bank of 128
Programs and 128 Combinations. This can be loaded into either the C or
D Bank of the keyboard so you can decide which Bank locate them into.”
This means that they give you the same set of new programs and combis
duplicated in both C and D bank, to simplify loading operations. In
other words, if you want the new stuff in Bank C, you could load Bank C
-> C. If you want the new stuff in Bank D, you could load Bank D -> D.
Note that there is no reason you can’t load Bank C -> Bank D, so I find
this presentation confusing, myself. Instructions for doing this are
located elsewhere in this document.
The ONLY EXCEPTION is the new orchestral board, which has 32 mb of
ROM on 2 separate boards, and ships with 2 completely new banks of
Programs/Combis (256 each).
See also Section “Karma vs. Triton” elsewhere in this document.