I'm really not sure how setting sustain to 1/8, therefore making a big fast jump from loud to soft, effectively imitates a violin. It might be more effective to set the sustain to 7/8 or 8/8.
I do not understand well what you meant about 1/8 vs 7/8. But I took this violin thing in the Custom Instrument Thread. Actually I wanted to make it a lot vibrato because it would come bugging a bit in the background, just as the "alto" part does in the original song.