yeah I am totally gob-smacked by all the cool stuff BIAB and RB enable you to do live. Just the ability to send voiceworks the information it needs to create custom harmonies on the fly to your live singing would do it for me.

But it also can do other things.. send data to a guitar harmonizer so it can follow chords, not just play to a scale...

Send data to MIDI capable devices to automate all sorts of things.. patch changes, volume, lights...

The backing tracks can have any number of changes, not limited to a loop that has to be taught in real time...

all that and more