MXR Pitch-Shift Doubler Operation Manual (Late 1970s–Early 1980s)

An original MXR Pitch-Shift Doubler Operation Manual from the late 1970s to early 1980s, covering one of MXR's pioneering professional rack-mounted signal processors. This detailed manual explains installation, operation, applications, specifications, and advanced pitch-shifting techniques, and is accompanied by its original warranty registration card. An increasingly hard-to-find piece of MXR documentation, it's an excellent addition for collectors of vintage studio gear, early digital effects, and classic MXR professional audio equipment.

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