Hillel Slovak in Special Secret Song Inside by Red Hot Chili Peppers at 2:33
creates a quick sound effect with his guitar that sounds like some effect put on feedback being panned rapidly.How is that sound created? From what I know about making feedback, it takes a second to get started, and it wouldn't fade that nicely either.
I think this might be another example with Jimi Hendrix playing Wild Thing at Monterey: https://vimeo.com/220996511#t=98s, which also resembles one of the many effects on Exp off of Axis: Bold as Love at 1:15 (couldn't find link).