You're obviously using the templates, and you are refering to the "head bobbing" motion they incorperate.
I don't use the templates, so I'm not exactly sure how they incorperate that. But as far as I know, they depend on the length of your animation, or more so the "stepping distance" your models animation uses. Perhaps if you could adjust the scale between movement & animating, you could keep your players feet from "doing a moonwalk", but also keep the sound from speeding up too much?