carol,
the paper towel trick is simply singing into a bunched up paper towel. you can get the same results by singing into a pillow or anything that will muffle one's own sound. many people sing much better while doing this. i think a lot of people sabotage themselves based on what they are hearing so, it removes that response. it also helps a singer think of singing as an action, the action that precedes the sound.
mike
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