Help your class manage their volume level with a Volume Level Poster. Each volume level has a color and number attached to it for visual reinforcement. One version has "6-inch Voice" with a star to indicate that's the class default level. The second version has all volume levels with circles. Simply print, laminate, and add a clip or magnet to show which level should be in use.
This poster is coordinated with the volume levels described in the book Decibella.
To print poster size, adjust settings in Acrobat Reader for "poster" on the printer popup window. Mine is printed at 160% and is the size of 4 pieces of 8.5x11" paper (with large white borders).