Busy weekend with 3 gigs in a row, Friday with the SOR, Rock gods on Saturday and Acoustic show at morans on sunday. Im writting a article on vocal blow out just now which will be posted in the vocal health section. Vocal blow occurs when you force to much air over the vocal folds as a result the folds swell and cut the sound. It can be difficult when performing as the last thing you want is to lose the voice. There is many other reason that it occurs but there isnt a lot out there on it. The trick is good technique and remaining focus plus a bit of a healthy approach to things... details on this will come soon.