Like Ripe said pre-production of n basic tracks and
additional live playing and knob tweaking on top is a good way of performing and less risky like starting from Zero.
I know Kraftwerk very well and saw several shows. They are all the same like playing a backgroud CD or Hard Disk of "Kraftwerk´s Best" plus sometimes one or two notes on top.
But they are the master minds of the machine music produced 20/ 30 years ago:) in opposite to glamour rock, etc and they setting trends. :woohoo: