So if the sound man can't make the system work properly, the solution is to have the singer's girlfriend crawl under the mixing desk? Was it the sound man who suggested this, by any chance? Hmmmm....

Seriously, those of us who play out regularly have all had our share of nightmare gigs. Keep your cool, smile, relax, and make a few mental notes about what went wrong so that you can try to avoid similar problems in the future. Then try to book another gig for the same crowd, so they can get another shot at hearing you when things are going right. Above all, don't get discouraged -- it comes with the territory.