How to blur faces in photos | On PC or smartphone without an app (Windows, Mac, iPhone)

I want to post a group photo from an event on social media. But I'm not the only one in it. There are faces of people I haven ...

My voice is quiet, but my headphones are loud. Two volume levels to separate with the Wave XLR MK.2

When I listen to my recordings, only my voice is quiet. So, when I turned the dial at hand, the headphone volume increased, ...