Hi Charles,
simply retriggering does the job, you should get a "bowchange" sustain sample,
the bowchanges you hear when holding a key (there are more changes at the higher velocities)
are the startpoints of the retriggered keys
this technique makes also sense to have some control when bowchanges are taking place,
you can't perform them later, but you can triggering them earlier, so this could help to place the changes at musical adequate positions
the only sustains which do not have bowchanges are the pp (vel 0-55)
but these samples are for that reason looped
best
Herb
PS: hope "bowchanges" is the correct term for the german "bogenwechsel"?