In DJ sets and laptop performances, an unprecedented level of technological mediation comes into conflict with the expected “liveness” of performance. As a result, musicians frequently express various techno-performative anxieties in explanations of their performance approaches. In particular, they are concerned that the audience experiences a performance, one that is imbued with a sense of live presence, rather than simply the playback of a recording or the clicking of a mouse. They work to convey this “presence” in a number of ways, which include dancing, other significant physical gestures, and the use of carefully selected electronic hardware. The audience responds in kind, thereby completing the liveness of the event. My talk will address these issues in both theoretical and analytical terms, drawing material for discussion from interviews and field recordings made in Berlin in 2005–2007.