apparently the feature I requested is already possible with the 2009 version.
It is possible to create a MIDI track and put chord changes or midi notes on it and direct the output of that track to an external vocal processor (which would then create harmonies for live vocals based on the chords or midi notes coming to it through the MIDI track)

This is SO cool!


Similarly, it is already possible to send patch changes to external devices such as effects processors.