Since the late 1980s, Pierre de Beauport has been Keith Richards guitar technician and also does some production and engineering work for the Rolling Stones. Keith Richards has a staggering collection of guitars and other stringed instruments, numbering well into the thousands. There are 5, 6, 10 and 12 string guitars, both acoustic and electric, in various tunings besides standard. All have to be perfectly intonated and tuned for the numerous recording sessions and the legendary live performances which the Stones are so famous for. Pierre's choice of tuner(s) include a Peterson AutoStrobe 490 and 590, a Node 12 window strobe and numerous Peterson virtual strobe tuners.