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In 1974 and 1975 the quartet, "Return to Forever," toured North America and Europe, playing to concert hall audiences. Highly complex and highly amplified, the quartet required a sound system capable of playing a variety of acoustic environments. Rose City Sound, of Portland, Oregon, provided a system, which, in addition to projecting to the house, afforded each musician a separate "monitor mix." The heart of the system was a twenty-channel four-way microphone-level transformer-splitting system: one "split" fed the house mixing board; another served as a "feed" to FM broadcasters; the remaining two fed two two-way mixing boards, giving the four "monitors" to the four musicians. With this scheme, the "house" is divorced from the stage environment, and a successful performance depends upon a fine interaction among musicians and technicians. Many features pioneered on this tour now are standard both in new hardware and in operating techniques.