abstract:Roger Mayer is the electrical engineer who developed several electric guitar effects, most notably the Octavia, an effects pedal which reproduced the input signal one octave higher, and mixes the two sounds with some added fuzz. The effect was popularized by Jimi Hendrix, and can be heard during the solos on the song "Purple Haze".
Meanwhile, Munich Open winner Mikhail Youzhny made an early exit to Latvian Ernest Gulbis 7-6 6-4 and 15th seed Stanislas Wawrinka set up a third-round showdown with world number one and Swiss compatriot Roger Federer after beating Leonardo Mayer, who was down 6-4 4-2 when he retired.