Each time I take a shot. My Huma reg on my impact makes a high pitched sound. Kinda sound like I shot a piece of glass. I don't remember it doing that. I had it for like 3 weeks. My stock fx amp reg didn't do that either but it does creep that's why I switch to the Huma. I know when you shoot the air from the tank goes into the reg section, but it make very little sound and you can only hear it if you listen closely. But now it's making big sound. My wife from across the room could hear it and she thought I hit the window or something. I thought it was my pellet making contact with the ldc. So I dry fire and it still make that sound. What's making it sound so loud after taking a shot? I was thinking of cleaning the reg but thought I post here and see if anyone know why.