I think this is a 'happy' sound?

hmm nope not working... I think my son may know how to add to you tube.... I'll check!

I can see the videos! Is it the little 'yak yak yak' noises you're asking about? I've never heard Byron make those, but your Skye seems to be contentedly fluffed up and is not running away when your hand comes in to stroke him so it's unlikely to be a noise of fear. When Byron is scared, he goes absolutely quiet, all his feathers go flat against his body and he will lean a little forward with his wings slightly out as if he's ready to take off. Skye isn't doing that, so I'm fairly certain it's not a frightened noise. As far as I know, all hookbills essentially want to fit into whatever flock they live with. So much of their world is sound, that parrot flocks of the same species have been known to develop different 'dialects'. This is why parrots in human flocks mimic human speech. Byron has experimented with all kinds of little noises before finding what it is we like. He's now settled on a little clicking noise, that sounds like kissing. You'll get to know his body language and, when you're used to that, it'll be a better indicator of the nature of the noises he's making. He's a real cutie though! beautiful colour!

Just curious, which post can you see the video? No 1, 2 or 3?

Oh Ok.. I'd be interested too. Thanks.

He does however make the same exact sound even when he's just on my shoulder. I thought it was just a little 'hello' from him. I agree he wasn't that keen when Joel was trying to pat his head for a bit. But as I said even when he's just sitting on our shoulder's he makes the little sound too

Ditto here. And you will also notice the shaking of the head. That means NO. She is very beautiful and I think she will come along very well.

Yoshi makes a very similar noise when he does the head shake. I as well wasn't sure what it meant at first, so I made a video and posted it here:

www.quakerparrotforum.com/thread/1117/shaking-head-squeaking

The advice I took away (and have learned since then is very true) is that he is saying NO. If I try to touch him, or offer him my hand as a perch, and he doesn't want to come, that's the exact behavior he displays. If I have him away from his cage and he's ready to go back, he does this as well.

Edit: It also looks like he is nipping the hand while he does it.  I think that is a clear indicator as well that he means NO.

I agree Skye doesn't appear to be enjoying the situation but what was described as "nipping at the hand" is something I have seen in every baby bird I have handfed where they pass the beak between the fingers searching for food as if they were pushing their beak in between a mothers beak. If he was only recently weaned that's probably what that part was. The noise he's making though and him moving to the shoulder to get higher where it is "safe" would mean he isn't comfortable with what you are doing.