<number id="delta" type="slider" arg="-delta %"
_label="MetaBall Movement" _low-label="Small" _high-label="Big" low="1" high="20" default="3"/>
<number id="delta" type="slider" arg="-delta %"
_label="MetaBall Movement" _low-label="Small" _high-label="Big" low="1" high="20" default="3"/>