Here is a quote from an older topic, maybe this helpful for you.
http://community.vsl.co.at/forums/p/21441/146762.aspx#146762
Here is my favorite setup to to trigger the same sample in any alternation patch, especially for sfz, fp sffz etc:
I use a dedicated Matrix,
In the first horizontal line (1A, 2A, 3A) I place my different articulations, like sfz, fp, etc.
On the "Cell Edit" pages I set the Volumes of all these patches to cero.
Now I generate a second horizontal line, and load here once again the same patches (with regular volume settings.
Now I set the vertical (V-Span) switch to Velocity control and set the level switch slider to a very low value.
Now I can play any "ghost notes" when I play with low velocity which will not sound.
So with an alternation patch, which includes 2 alternations, performing one ghost note between the regular notes will give you always the same alternation sample.
Of course the ghost notes have to played on the same key as the regular notes.
best
Herb