i'm not sure if this can be even put into action - one of the reasons is the higly multi-dimensional structure of the Vienna Instruments.
to trigger the sampling engine the GUI has to communicate with the software *below* (tell the engine which settings you choose in the various configuration pages), this has to happen very fast because the Vienna Instrument can switch between an incredible number of layers (matrices, ect).
the other way around needs communication in the other direction to let the GUI know details about the used patch, matrix, cell, ect - this can change actually faster than your display is able to refresh the screen (depending on your hardware between 50 and 100 Hz), otherwise it would make no sense. such a feature would not only be always delayed but also consume heavy resources which might be better used for the sampling engine itself.
christian