Actually, I nedd to revise my last statement.
I just tested it in detail again and found out that both are not true.
The first note can be something like a sustain patch for example and the second a performance patch and there will be a transition. As well there is no real overlapp needed.
Strange, I have no idea why I remembered it like this?[*-)]
But the legato effect for certain instruments is quite subtle. You can easily hear it from the trombone ensemble.
Or just try portamento instead and see if this works first.
ANother thing to consider is that the performance pathes are sampled only one octave up and down from the starting note.