You can change the color of text in most Max UI objects with the textcolor attribute. Note that the color must be specified in the RGBA format—red, green, blue, and alpha (opacity)—rather than simply RGB. That is, textcolor requires four arguments, and will not work with only three.
The slider object has some attributes that have a significant effect on its output: floatoutput, size, min[imum] and mult[iplier]. By default slider uses only integer values, with a size of 128 (i.e., ranging from 0 to 127). For an integer slider, the range will be size different integers from 0 to size-1, whereas for a float slider the input range will be the full range from 0. to size., inclusive.