Strings instrument questions

[Mason2015]

Hi there, I am pretty lost when it comes to operating my Krome, but I think I have the basics down.

I am interested in playing some orchestral and string type music. The problem is that the string instruments all sound way too "electronic". They have sort of a harsh, "brassy" noise rather than a soft, "string" noise. Is there a way to alter the sound of instruments on the Krome so they sound more natural? A little more like an actual string instrument, maybe?

Plus, I want the notes that I play to flow better; I play the notes with the string instruments and they cut off really fast. I want the notes to fade out or echo for awhile after I let go of the key so the first note resonates while I play other notes.

Thanks a ton!