Hi Ian & the Others,
there are some who feel the problem still exists for that one sound, DNC Real Violin. If the sound is held for more than approximately 4 seconds, there is a slight break in the tone/sample that shouldn't be there.
This break is the bow direction change. As soon as the end of the bow is reached, directions is changed, and there is a short dip in volume. This is how bowing happens in a real violin (hence the name of the sound).
In case you don't have a violin player to show you this phenomenon, please look at this interesting video I found on the web:
http://www.wonderhowto.com/how-to-do-smooth-legato-bow-change-for-violin-153683/There are other Violin sounds in the same bank, with a shorter sample and a more uniform, looped sustaining phase. Maybe in some cases you might need something like this 'old-school' kind of sound.
Paolo
(Korg Italy)