Thanks for the interesting question...
I too can produce distress calls on any one of my howlers. So I wouldn't be overly disappointed.
PredatorPaul does bring up a question that I've had, though. I often find myself on stands where I feel like coyotes may be close and I'm concerned about blowing them away with a distress call or howl.
Does anyone begin their sets with lip squeaks in situations like this?