I belong to the foghorn club too, but I still find it difficult to start if there is a lot going on. Didn't used to be the case. I used to just jump in and if people stopped to listen, ok. If they didn't that was ok too.   usually the shear volume of my voice settled every one right quick.

Now, I feel like I am interrupting the goings on, if I just jump in. Suddenly I've come over all shy. If I could work up witty or informative things to start, wedge in that AHEM moment before I launch in song it would be better. Too shy for that too.