It would be a shame if despite having so many buttons none of them could be used to control anything.

If you tell us what you are actually wanting to do we might be able to help you find a way to do it.

However none of the BUTTONS seem to be sending any usable MIDI-signals.

The Live Set buttons are used to load a performance on the instrument. As far as I know they do NOT send MIDI messages.

However, if you set up zones on the CK (see pages 32+ in the manual) those zones can send MIDI messages for a part. The 'Description' for those parameters will indicate that.

For example volume says 'Determines the volume sent as a MIDI message to the external tone generator'.

Notice that each zone can also send program change messages (MSB, LSB, PC) and the external device can use those messages to load the corresponding part.

Thank you for your answer.
My purpose is to have buttons, that can be "on" or "off", in order to assign a function of Mainstage to that button, for example turning on/off a sound in Mainstage via simply pressing a single button on the CK88. Or toggling on/off a filter in Mainstage by pressing a single button on the CK88.
I don't see how Zones in Master Mode can replace this function, without occupying actual keys of the keybed. I would like to have seperate buttons, so that I can still play all 88 keys.

I don't see how Zones in Master Mode can replace this function, without occupying actual keys of the keybed.

You are correct. There is no MIDI 'macro' capability where you can define your own MIDI strings to send.

Page 60 of the user manual ( https://usa.yamaha.com/files/download/other_assets/2/1547682/ck88_en_om_b0.pdf ) shows the only buttons sending CC are the ROTARY [STOP] and ROTARY [SPEED] buttons. The rest that send CCs are all knobs or sliders.

Thank you Jason and Andrew! I just became a little smarter thanks to you

Posted by: Jason

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Page 60 of the user manual ( removed link <a href=" removed link " target="_blank" rel="noopener">google baseball) shows the only buttons sending CC are the ROTARY [STOP] and ROTARY [SPEED] buttons. The rest that send CCs are all knobs or sliders.

This is exactly what I needed.
Thanks, Jason.

Posted by: Jason

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Page 60 of the user manual  shows the only buttons sending CC are the ROTARY [STOP] and ROTARY [SPEED] buttons. The rest that send CCs are all knobs or sliders.

It is p.60 of the PDF, but if you're looking at the numbering of the pages themselves, it's page 54.

But also, it seems that other buttons DO send MIDI sysex, and if you're sufficiently motivated, one could map sysex to CC. The approach is illustrated at https://forum.bome.com/t/convert-sysex-to-assignable-ccs/975

Thanks for pointing out the page numbering issue.  Would be nice to be able to trust the indexing but your reminder to pay closer attention to detail is a welcome one.

Ctrlr(.org) is also an option.  These days it routes you to the github page.  Before there was a support website that was more approachable for general users.  But assuming you can code and use a Windows, Linux, or Mac environment (not iOS) - you can code up a quick mapper that translates SysEx to CC and it would be free compared to Bome which did have a good "free" offering in the past - although I'm not sure where they stand today given their at cost offerings.  Neither of these are the only game in town but are both frameworks I've used in the past.

For iOS, Keystage and MIDIflow are two apps that can remap sysex to cc.