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Here the barberpole filters on left & right channels are running in opposite directions: falling on the left, rising on the right, (I think).
Compare with pre-pole ... https://freesound.org/people/Timbre/sounds/653679/
Type
Flac (.flac)
Duration
1:04.000
File size
6.4 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo