Matlab creating piano sounds (strange sound problem)

Question

Hello I have to build a program that is able to play some piano sounds from beethoven elise

Now I have implemented the function for the frequency and the sound but it so

Answer 1

As mentioned in the Comments, the sound that a piano makes is quite complicated. As such this is not a Matlab challenge, just a math problem.

Now that you know this, you 'just' need to come up with a reasonable mathematical approximation, and from here it should be straight forward to implement in Matlab.

Here is something to get you started with the math:

https://dsp.stackexchange.com/questions/46598/mathematical-equation-for-the-sound-wave-that-a-piano-makes