Hi Luca,
Thanks for this report, this seems to be a problem in the Stage setup itself. You can easily fix it be going to delete mode and removing the the 8 scale buttons in the tab, then go to create mode, wait for all the agents to load and scroll down to "scale talker 1" and expand it. You'll see 8 keys there that correspond to the keys on the Alpha. Expanding those and dragging each 'activate' onto Stage will create a working button for you. After that you can position, resize and name the Stage buttons as you see fit.
We'll fix this in the factory setups for a next release, sorry for the inconvenience.
Take care,
Geert
Eigenlabs Software Team