After years of withdrawal from live performance Kraftwerk began to tour Europe more frequently. In February 1990 the band played a few secret shows in Italy. Karl Bartos left the band shortly afterwards. The next proper tour was in 1991, for the album "The Mix". Hütter and Schneider wished to continue the synth-pop quartet style of presentation, and recruited Fernando Abrantes as a replacement for Bartos. Abrantes left the band shortly after though. In late 1991, long-time Kling Klang Studio sound engineer Henning Schmitz was brought in to finish the remainder of the tour and to complete a new version of the quartet that remained active until 2008.