@XUHAOCHEN, It is indeed an important thing that the Nova is fine-tuned by you. I did not have the opportunity to stay in Italy for a few days. My dealer has done that but it is always better by yourself. That's why I can send my Nova back to the factory free of charge in a year and a half to have it set up all over again and to address any teething problems. I would definitely ask that if you buy from a dealer about that. because there are guaranteed teething problems that need to be solved with every new accordion.