Changing slider speed

I’d love to slow down the default settings for the slider speed. I feel like I should be able to do this is in the jquery.flexslider.js where I find the following:

slideshowSpeed: 7000, //Integer: Set the speed of the slideshow cycling, in milliseconds
animationSpeed: 600, //Integer: Set the speed of animations, in milliseconds

Even substantial changes, however, result in zero change.