I was wondering if you all would mind listening to my attempt at a siren and tell me what I'm doing wrong. Am I flipping into falsetto or am I just pinching off the note? I know I'm doing something wrong but I just can't figure out what it is.

You flipped a bit back towards falsetto, though it happened without a huge break to point it out. Start about a half octave lower and work up a step at a time. When you feel that little smooth flip wanting to occur, slow down the speed at which you are sliding up. When it happens, step back down half a step and try it again. Then, go up half a step a retry. Do this several times at the top end of your range. It will work out the muscles and begin solidifying the coordination so you can maintain full voice;)

Wow. Thanks so much. I'll definitely work on doing that.

Btw. I never could understand why I should have started lower but I do now. When I did it starting much lower I could really feel everything rise up like the the lotto balls analogy. I guess I was starting higher because I was running out of breath but I actually have more breath when I start lower and take my time. I can only assume that is because I'm not forcing anything which means I'm not using more energy than required.

My friend , you are using too much breath and i can hear by the tone of your voice that you are not supporting well. Start big , end big. Keep the same tone as you go higher and push down more. :)

It doesn't take massive amounts of breath, so for you to say you have more breath starting lower points that you need work. Most singers want to start high and forget the low part. Start on your lowest note and work from there up;) You'll be surprised how much working the low voice benefits the high voice.

Thanks to the both of you for taking the time to listen to my sample and the great advice. I've gained several notes but now I have to use that advice to get them smooth and sounding good.