174383a9_r_Control_v1_1___Documentation__Key
[Description] Sets the discreteness of the values returned by the slider. This parameter is optional, if omitted the value will be calculated exactly based on the position of the slider, otherwise it will be rounded to the nearest step. The steps are counted from n_minValue (not from 0) so the result will be not necessarily the multiple of the n_step. If both n_step and b_watch parameters are set then the slider will snap between the steps when moved, with b_watch set to false it will move smoothly and snap to the closest step location when released. This parameter can be used to set the precision of the result i.e. setting step to 1 will return only integers, setting to 0.01 will round the result to 2 numbers after the decimal point (this assumes the n_minValue is the multiple of the n_step). [Accepted Values] number multiple times lesser than n_maxValue - n_minValue [Key] 
n_step
Tigra Slider Control v1.1 - Documentation
Key