Rickenharp took the Strat out of its case and strapped it on. He adjusted the strap, pressed the tuner. When he walked onto the stage, the amp’s reception field would trigger, transmit the Strat’s signals to the stack of Marshalls behind the drummer. A shame, in a way, about miniaturization of electronics: the amps were small, though just as loud as twentieth century amps and speakers. But they looked less imposing. The audience was muttering about the Marshalls, too. Most of them hadn’t seen old-fashioned amps. "What’s those for?" Murch looked at Rickenharp. Rickenharp nodded.