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. Unfortunately, the device did not work as planned, and it was quickly abandoned. The same year Ralf Hütter and Florian Schneider commissioned Bonn-based "Synthesizerstudio Bonn, Matten & Wiechers" to design and build the Synthanorma Sequenzer with Intervallomat, a 4×8 / 2×16 / 1×32 step-sequencer system with some features that commercial products couldn't provide at that time. The music sequencer was used by the band for the first time to control the electronic sources creating the rhythmic sound of the album "Trans-Europe Express".