Now I'm confused too...
Getting sound from a MIDI keyboard? MIDI keyboard as in a regular controller (they have no sounds you know), or a MIDI keyboard as any regular synth?
And what does "Get that sample sound" mean? If you have a keyboard,
most likely you will have a grand piano sound in it - it depends on the age of the keyboard and the
manufacturer how good the sample is.
You really can't expect a great piano sound from an old keyboard.
Then again, you could always plug it into your computer and use a VST of some sort
The rest of it - is just pure tweaking and variations on the same sample set.