You should use Sound Hack to display the curve or the spectrum of piano tones.
You'll learn a lot in an intuitive way.
It works on Mac and is freeware.( Maybe on Windows to?)


Hans van den Tillaart a écrit:
> 
> Hello,
> I want to know as much there is on  piano sound characteristics. I am
> trying to emulate piano or pianolike sounds in CSOUND.
> Which formants are there in play?
> Do they alter when you increase velocity and or playing from low to
> high?
> What does exactly change in the spectrum when velocity is increased?
> How does the sound evolve over time when looking at the spectrum ,
> attackfase release?
> Sure there are more characteristics when trying to emulate ... wich?
> Is there software for investigating formants?

-- 
Jean-Michel DARREMONT