How to remove high frequency sounds?

I have a video where there’s this very annoying sound in the high frequency that repeats every few seconds. I’d like to remove those in Shotcut but I can’t figure out how, I tried Noise gate but either it doesn’t do this or I’m not tweaking it right, I also tried the Equaliser filters and still couldn’t make any difference.

In audio visualisation I get this kind of graph so I just assume if I can cut anything above 10khz I’m good. How can I do this?

low pass filter

Yep, this one did the trick. Thanks!

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