I'm really glad that you found something that works for you!
I don't know anything about the training method you describe, but positive reinforcement training had the same outcome for Loki. Yes the good old clicks and treats, no "aversives". Also something called the Nothing in Life is Free method, which also makes dogs realize they are not in charge. Sounds like your trainer uses similar methods - just not sure about the tuning fork thing, but hey if he's not yelling or hurting the dog I'm not going to criticize!
Isn't training fun? We signed up for puppy class over a year ago and just kept taking classes!