[Note: I don't see the part VI "in the woods" test yet, but the author cautions that his preliminary testing indicates different results than in the over-water test.]
From what I've read in other studies, lower pitched whistles with distinctive trills have the best performance across wooded terrain. But, they tend to get lost in noisy environs.
The urban SAR folks seem to prefer the high pitched referees' whistles. Probably for their ability to cut through background noise.
I don't understand "too easy"
Imagine playing a brass instrument with a large mouthpiece and a wide bore. Something along the lines of a bass trombone or tuba. You don't need a lot of air pressure, but you need a high volume of air to play it. At fortesisimo (triple forte), you may only have 3 seconds or air in your lungs. That's what "too easy" refers to.
Conversely, "too hard" refers to needing high air pressure, but very little air volume. Something like a pocket trumpet or a clarinet. You're carrying 10-20 seconds of air, but you're going to herniate yourself at full blast.
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