I know you can display the CC00 CC32 and PG numbers for each tones on the BK-9 by pressing couple of buttons, instead of looking in the Tone List all the time, I just can't remember the combination of those buttons. If you know it, please let me know, I've been searching the entire manual...

I couldn't find it. I searched the PDF manual for "number." I also looked at the manual for my trusty old Roland E-50, and couldn't find it in there either. Yamahas have the ability to optionally display the program numbers of tones in the display. Perhaps that's what you're thinking of?

Yes, and the BK-9 is also capable of doing the same, except I can't remember, how to...

I found it!! In the tone selection browser, press and HOLD the "Numeric" button. All of the tone details will be displayed as a pop-up. Press Numeric again, or Exit to dismiss the pop-up. (From p.159 of the manual.)

I was searching the physical manual, but you gave me a good idea to search the PDF, and I found it too. Thank you for your help.

Amazing what you can find in the manual! 😂🎹