I would definitely call it advanced. I go over whining, soft yelping, clucking and purring, kee keeing, bubble clucks, tree calls, cackling, excited yelping, cutting as well explain how to attain a front end on your yelp. I'm not sure your definition of good on a mouth call, but I have had TONS of veteran turkey hunters and competition callers share their success of improved calling with me. Just food for thought.
Thanks!
scott