I agree with scampercom about the sound quality being off. The sounds sound thinned out. I use in-ear headphones (not Apple’s) to help blocked out co-workers when trying to concentrate. I usually listen to music but sometimes that can get tiresome and I prefer white noise. DarkNoise, though I really like the selection, probably wouldn’t help. The sound quality from other apps like Noisli and Noizio are better, with Wildfulness being the absolute best with 3D sound. I can mix sounds with Noisli but DarkNoise hasn’t been updated in a year or so and you can hear the looping. Noizio is updated, has more sounds than Noisli, but you can hear the looping and it requires so many in app purchases to expand the library. Wildfulness, Wildfulness 2, and it’s 3rd counterpart Sonas Island (or something like that) has beyond amazing sound quality. You can hear the looping with a few sounds but it’s biggest flaw for me is the lack of variety. It’s ALL nature sounds. There are other apps I have tried but most were unnecessarily complicated or not worth mentioning. DarkNoise is good for it’s simplicity, ease of use, features, and variety, but unfortunately not it’s sound quality.