I am not a Reface CP owner, but find this thread (and similar threads all around the internet) very entertaining :p

OK. By now the whole world knows:

1. The Reface CP has a hidden acoustic piano sound.
2. The procedure to unhide this piano is awkward, but reproduceable.
3. Yamaha still hasn't given an appropiate reaction to questions about this subject to the community = their customers.
4. Nobody can believe Yamaha doesn't know more about this easter egg.

So? Where are you Yamaha?

still nothing to say on it yamaha?