hi,just to make a point,1 inch,equals 2and a half centimetres,ie 25mm,over 5 octaves that is 5mm per octave,less than 1 mm per key,what seems more of a problem to me is this ,if for example i play C,E,G,Bflat with the left hand the forefinger playing the G note each note either side ie,Fsharp and G sharp they rub the side of the finger,thus giving the impression that the keys are smaller,what are your views on this point mike