In an interview with the magazine Musikexpress in December 1976, Ralf Hütter and Florian Schneider of Kraftwerk talked about their instruments. Alle Instrumente, die wir mit unseren Ingenieuren entwickelt haben, sind patentiert. All the instruments we have developed with our engineers are patented. They wanted to produce them in series and sell them. They had also built an electronic flute themselves, which they called their magic flute.