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Hello everyone! Have you guys experienced the same problem as I did? I just bought the PX-780 and I think everything on it is pretty impressive, except for one thing: When you play between forte and fortissimo, the volume of the sound steeps up considerably. (see attached graphic) This happens mainly with the main sound 001 Grand piano concert, but is also an issue with others such as modern piano, rock piano, etc. I found that it should be a software problem as the 004 Grand piano classical and 007 Grand piano dolce don't have this problem but... I don't like them too much as the sound is too mellow for my taste. NOTE: I tried changing the touch sensitive to 3 but the problem persists. I saw that another user at Amazon reviews has also noticed this problem, so it's not my imagination. Also, if I use the Privia piano as a MIDI controler and use a VST such as Pianoteq on my PC there is not such problem. What do you think? For me this is just not acceptable, I have played digital pianos for more than 20 years (Roland, mainly) and this was never an issue, so CASIO, I hope you are able to solve this problem soon via a software update or something like that. I have wrote to CASIO technical support but have no response yet after 3 days. tip to CASIO tech staff: maybe you forgot to normalize between several "layers" of samples when you build the virtual instrument. Please help me if you are able.