Very strange, Spyder, I've never heard anyone say that of western trained horses... makes me wonder. I'll have to do some research, because you've got me curious, ha ha.
I disagree with Sixxofdiamonds "kiss" as part of a request for canter/lope also. It must be very noisy in a western arena with all that kissing and "clucking" (another verbal western aid) going on. If you "kissed" to my horse and he would have a clue what all that noise is about....although he may think that you have food for him.
The one thing that has always had me wondering is...............do you kiss or cluck differently for a left lead lope than for a right lead lope???