You have use the number keys on the remote to access the other voices, and that only seems to be available on the more advanced tricks.
I think it is well worth the money...
It has several things that I found valuable.
The footage they use, front and side as well as a great visual on the type of cut you need, really lets you see every part of a trick.
If you follow the "tree of progression" that they lay out for each trick, you can become a more solid overall rider, and master each trick quickly.
The "two minute drill" and the "four minute drill" will be great for the newbie riders I have riding with me. It gives them a clear goal that is fun to work on and acheive, and they will build strength and skill while working towards it.