Hi everybody,
I have a new Keylab25 and i spent hours trying to find solution to transport buttons problem. I followed the instructions (with screen shot) found in this address:
http://downloads.arturia.com/downloads/support/howto/pdf/KeyLab/Keylab_Cubase%20files.zip
Open in Cubase Transport > Project Synchronization Setup > Machine Control Input section
Click "MMC Slave Active"
In MIDI TimeCode Source Section and select your Keylab Keyboard
MMC input : ALL MIDI Input
MMC Device ID : 127
But this didn't solve the problem.
The firmware version of the unit was v1.23 and in the Arturia's website the last firmware was v1.19 and this was the reason why i didn't updated the firmware.. because the actual firmware in my keylab was newer..
Finally i downgraded to v1.19 and everything works fine.
Hope this can help you.