So I received my Fox 40 whistle today, and I just can't seem to get along with it? I used to use an ACME thunderer, and all the threads I'd seen seemed to suggest the Fox 40 was a great whistle, but unlike my Thunderer, it seems to require a lot more effort and air to produce a good hard blast, but I'm just not sure if it's me, haha! But seriously am I doing something wrong, any tips on how to use it more efficiently? Might sound a stupid question but is there any technique to blow a louder blast?