Thanks for posting this. I thought it was just me.

I find that the lower pitch whistles cut through a lot more clutter and carry further. And it's not just my middle-aged ears: my hounds will hear a lower pitched whistle (like a Storm or even a flat 3-tone PFD whistle) in wind conditions or when bounding after a snowshoe hare. The higher pitched whistles like the classic Fox 40, loud though they are, don't carry.