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According to Roger Mayer's official site Roger lays out an official timeline of when Jimi was first introduced to this pedal:
"1. The Octavia / Octavio sound was first heard on record in the solo of "Purple Haze" and this solo was recorded on Feb 3rd 1967. I first met Jimi on Jan 11th 1967.
The source and notes on this submission are correct.
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