First off, you need to be getting the behavior you like before you put a cue to it. So make the noise, click and treat. Repeat until the dog is starting to offer cocking his head. Capturing behaviors can take awhile. And I usually find that there is a point where the dog's body starts doing it but before he is consciously aware of what is earning him that treat.
Secondly, when introducing the cue you want to do it BEFORE the behavior. With a simple sit, I would say "sit" right before I thought the dog was going to offer it. Or if I was luring the sit, I would say "sit", wait a second, and then lure the dog into position. I wouldn't say it after he had already done it. With this trick, you would give your verbal cue, wait a second, then make the weird noise. Although like I said earlier, I would personally wait to add a verbal cue until I didn't need the noise anymore.