Reading a piece on the introduction of the Wah Wah pedal to music recordings. Lo and behold, one of the earliest examples in the recording studio was by Frank Zappa when he recorded the song "Spaceboy" for QUEEN OF BLOOD!
http://www.laweekly.com/music/50-years-ago-the-wah-wah-pedal-was-born-in-a-hollywood-hills-garage-7767475Casher, who also invented the Fender Electronic Echo Chamber and worked on Roland’s first guitar synthesizer, was no mere hired gun. He was an aggressively creative musical explorer eager to take on any artistic challenge — including jamming with the most experimental L.A. band of the era, Frank Zappa’s Mothers of Invention. “I had a nice garage studio at my place in the Hollywood Hills,” Casher recalls. “One day, Frank Zappa knocks on my door and says, ‘I hear you have a good studio.’ I’m looking at him, with the beard and the hair, wondering who he was.”
Zappa was on assignment to do a song for Roger Corman’s 1966 sci-fi flick Queen of Blood, and he needed an out-of-this-world sound. “Frank brought [actor] Florence Marly in, she’s singing these really wild lyrics, ‘Space Boy, Space Boy, sex without soul,’ and I thought it’d go nowhere fast.
“I started overdubbing my parts, and Frank says, ‘Make it as spacey and weird as you can.’ So I got my oscillator out, and soon the sounds were whizzing by, really weird and wild. And then Zappa says, ‘Can I overdub the drums now?’ And I thought this wacko is going to screw up everything I just did. In one take, he did it, it was perfect. We hit it off, and he invited me to join his band.”