You may want to check all the filters in the capture log window (the eye icon on the up-right corner) and check out if the switches are functional. If it works, you should see more than one Switch to "stone", "dirt" or something, as well as some API-calls. Check out if you receive the correspond API-calls as you walk to different surfaces. I guess, in your case, they are all good, and then you should check out if you correctly set the switchgroup in your container's general settings. Don't forget to pull your child containers or sounds into the switch group in the Contents Editor window. (by default layout, it is seen in the middle, and on the right side there's an "assigned Objects" and it should be your place to go.