I've been reading the threads on support with great interest. It really can be confusing when you don't "get it" physically...and when you do "get it" physically you don't bother with the details any more.

I think I've managed to figure out quite a bit about support that I'd like to share. When I fail to support, I can usually understand intellectually why I failed. That helps me a lot when I do a second attempt. And as much as I would like to help people out by answering their questions, I feel it's a lot easier to give my own version uninterrupted, from start to finish. And by all means, *please* correct me whenever I'm wrong. And I probably am dead wrong in several places, haha!
These are the characteristics of support, IMHO:
1) Support is not exhalation. In fact, it's almost the opposite. It's about holding back the breath.
2) The airflow is controlled by using several muscles in the flanks, back, pelvic basin, solar plexus and lower back. This is laid out in beautiful detail in the book.
3) As these muscles tense, they grow in girth, thereby exerting a pressure on the lungs. A bit like a bagpipe player pressing his elbow on the bag. With practice, you can control this pressure to a very high degree. You can also balance the force with which you hold your breath back with this tension. This is why it feels (should feel) like a tug-o-war between two opposing forces meeting in the middle. The main point is that the five tensed muscles are what squeeze the air out. This also explains nicely why you are out of support when the muscles (for instance in the solar plexus) are all the way out.
4) It's nearly impossible to sing using support alone. Maybe in low volume airy neutral, but it will likely wear your voice. The airflow has to be restricted by placing an obstacle, or all the air would escape. The obstacle highly influences the sound. This influence affects how the long closed phase of the cords is, how big part of them vibrate, etc. Examples of obstacles are tension in the back wall of the mouth (creates overdrive), distinct twang (Edge, ELN, MLN) or hold (Curbing). Many teachers call this obstacle "compression", which I find a confusing term. Sure, the air is "compressed" somewhat as it passes the obstacle, but I still had a hard time getting it. The obstacle, to me is similar to putting a mouthpiece on your garden hose. If there's no mouthpiece on, you have a broad stream of water that doesn't go very far and quickly exhausts the well. If you put a mouthpiece on, though, you can shoot a highly focused, straight ray of water 10 meters and still hurting the guy you hit! With less water.
5) For the above reasons, singing *has* to be about inhaling, supporting, exhaling, and so on. The amount of air you use for singing is nothing compared to breathing.
What do you think? Did I get it right? The reason I'm writing this down is because I was really missing this. If someone had explained support to me like this when I was starting, I would've grasped it much sooner.
/Dino