Voice If I can do only one exercise for some reason, this is the one I will always go to. It’s called the Siren, and it really gets your voice ready to give of its best. It’s like a sine wave, moving from the highest your voice will go to the lowest, with the sound WEEE at the top and AWWW at the bottom. As your WEEE-AWWW-WEEE-AWWW sound swoops from high to low, be conscious of any discontinuities.