The organ issue.
Our first idea was to play with the organ in Notre-Dame D'Harscamp Church. Unfortunately after a quick checking, it didn't still work at all.
So we decided to work with an electro-mecanic grand piano for the project. As this kind of innovative piano is only achieved by Yamaha, we decided to present them Portée/. They were enthusiastic on the project, then we had chance to work with one of their beautiful grand piano: a Yamaha Disklavier DC6XE3PRO.