Layer
This parameter supports Polytonality in that it assigns one of up to four variations of the Harmony parameter to individual instruments. Each such layer may use a different chord, effectively superimposing them over other chords at the same time.
Properties
Using the fader (slider) on the Parameter Inspector sets a particular value for the entire duration of the container (constant). If you want to continuously automate this parameter, you need to draw values in the Parameter View.
Conversion
Drop any parameter with a curve-like shape. The form is preserved as far as possible and values are scaled into range.
Instead of drag and drop, you can also use copy and paste.