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31 PROTUNE  Turn on Protune to take manual control of Color, ISO Limit, Exposure,  microphone settings, and more.  To learn more, see Protune (page 112).  INTERVAL (LOOPING)  Choose how long your GoPro records before looping back to record over  the start of the video.  To learn more, see Looping Interval (page 101).  Video Settings
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