If you are running sound. Tell whoever is on stage to leave you lipstick. (meaning keep the mic as close to thier mouth as possible) You should do this for several reasons, first off to the audience people who hold the mic real low look stupid. Second, with the mic close to their mouths you will get a better sound, with less background pickup. And the best reason, with thier mouths closer it will allow you to lower the mics gain and pick up more volume with a lower chance of feedback. Keep that in mind next time u have a mic you cannot control on stage. Half the battle with sound is teaching the people on stage how to use the mics. As much as I would like to say the sound tech controls the sound on stage, the actors MUST do thier part to make a sucessfull sound.