Thanks Alan. At the time of my control, at the reception of the instrument (new from Japan), I noticed, even before having put the instrument on my lips, that there was in the central part of the keyboard a infine curve in “U”, but very weak … you know when you look at a piece of wood to see if it is right … looking at the P37E the same way under different angles I found this very light curve which gives a slight unevenness of the pitch of the keys on an octave (from E to E) in the central zone of the keyboard. Maybe that would be an indicator ….