An automatic level controlling apparatus for supporting an appliance includes a hollow leg body, a piston inserted in the hollow leg body, a spring seated on an upper portion of the piston, a cap disposed on an upper portion of the piston to support an upper portion of the spring, a frictional member disposed around the piston, and a piston rod coupled to the piston and supported on a floor. The switch translates primitives used for performing storage operations into commands executable by the physical storage devices so that the data moving portion of the storage operations can be offloaded from the file system to the storage devices. These overlapped tracks could be multiple in number, enabled or disabled by the listener or subsequent reviewer, without tampering with the content of the originally recorded video or audio. A maximum one of the corner offset metrics is selected as a die placement metric. The phosphate ester is of the formula: 1where R can be aryl or alkaryl, R can be arylene, arylene-alkylene-arylene, or alkylene, and n ranges from about 1 to about 5.