A supply voltage andor bias of a switching amplifier is modified based on at least one characteristic of the input signal relative to a threshold level. The invention also provides methods for preparing, coompositions comprising, and methods for using compounds of Formula 1 for treatment of central nervous system disorders. The verification module is also structured to apply a reward credit in association with only a first user whose user information is associated with the unique unit identifier for the select media storage device. A plurality of large tiles is set on top of the grid-like pattern to produce a first ornamental design.