I'm a fan of high pitched calls too, just because they've always produced better results for my area. Use whatever works best for you and your area, don't go with some stupid trend. I've had a lot of recent success mixing in low and high pitch yelps in the same sequence of calls. So in a series of 5 yelps, I'll mix in one higher pitched yelp, maybe two normal pitch then one high pitch followed by two more normal pitch yelps. I've found that it drives a hot tom crazy here in my area. I called 3 field toms off of a group of hens 2 years ago by doing this, killed one of em at about 12 steps. Any of yall ever try to mix in some trashy sounding calls or do you usually try to keep it clean and crisp?