you don't even need the app. Hold the selector button for 2 seconds, and it does it in headphone. And Dusty, you have the choice between silence or just background noise elimination.
Ok, I got the sony wh1000xm2 noise canceling headphones. They're amazing. They sample the base noise, and delete it. For working in a loud environment like a data center, they're a life saver. I can hear people talk, without the constant base fan noise.
And they sound decent.
Nothing about that product made sense. Poor aesthetics on the player, smoke, mirrors and snake oil on the sound quality, and yet another file format that no one else adopted.