Thanks for the help technicsplayer!

I did checked the blue manual prior to posting this thread and it seemed to only map the drums sounds up to the 4th octave.

Guess I have to either remember / document the additional sounds located on the 5th octave for future use.

Wonder why these additional sounds were not documented in the manuals and why it cannot be played on the keyboard easily? Many of these additional sounds were used for the preset rhythms.