I was cleaning the house when I saw the recording of the songs of the choir group of my office where I was a member of. I played it. I noticed that our song recording was not so good. I noticed some popping noise over the recording. I wonder if the microphones used ever had pop-noise protection filter just like the function of ps101. The fast moving air causes mechanical impact over the microphone and this popping noise coudl have been filtered by the pop filter. Anyway, now that I know about it I will next time recommend it to recording studios whenever I have the chance to record again.