I'm not sure what you mean. Basically, switching from one sound to another can be done by creating an array with all the names of the sound files and then have a number variable that you change accordingly. When using autoplay, you would then call
-> XAudio2: Autoplay file AppPath & "enter your sound folder here" & YourArray(YourVariable) (No loop)
If this is not what you're looking for, then please explain it with more details