"My interest in his new toy, the Theremin, isn't very big. It simply does not fit into my way of playing music. I do not want to fiddle around with my hands in the air"

Klaus Schulze is expressing his absence of interest in the Theremin, a brand-new musical instrument. He is suggesting that the instrument does not fit into his design of playing music, and he does not want to have to use his hands to play it. This might be since the Theremin is an electronic instrument that is played without physical contact, and Schulze may prefer to play instruments that need physical contact. He might likewise make love that the Theremin is too hard to discover and master, and he does not want to put in the effort to discover it. Ultimately, Schulze is expressing his choice for instruments that he is more knowledgeable about and comfortable playing.