Thread: Space ambient trance builds
Kraftwerk also used modular gear starting in the late 1990s, mainly Doepfer stuff. But really, not until then.
If you want to talk about who was the heaviest modular user in the Krautrock scene during its most significant period, that would have to be Klaus Schulze. Klaus's setups during the latter part of the 1970s would find EMS AKS, Korg PS3300, ARP 2600s alongside a huge hybrid Moog/PPG modular plus a bunch of other prebuilds, all in use at the same time, especially live.