Kraftwerk used a custom-built Vocoder on their albums Ralf und Florian and Autobahn; the device was constructed by engineers P. Leunig and K. Obermayer of the Physikalisch-Technische Bundesanstalt Braunschweig [REF].
On the Radio-Activity tour in 1976 Kraftwerk tested out an experimental light-beam-activated drum cage allowing Flür to trigger electronic percussion through arm and hand movements.