+ <number id="tvbrightness" type="slider" arg="-tv-brightness %"
+ _label="Brightness Knob" _low-label="Low" _high-label="High"
+ low="0" high="200" default="150"/>
+ <number id="tvcontrast" type="slider" arg="-tv-contrast %"
+ _label="Contrast Knob" _low-label="Low" _high-label="High"
+ low="0" high="1500" default="1000"/>
+