Displays or not the main knob.
If OFF you can still change the knob position but only the value is displayed).
Example with 2 design different styles.
Color of the knob position indicator.
Red knob example.
Design layout of the knob: normal, symmetric, as point.
examples of design options
Width of the colored line.
Thin cursor width
Displays a round knob cursor.
*Example of rounded cursor.
Sets the difference between start and end of the cursor. Small value gives you a complete size, high value reduce the knob action.

Center circle color.
draw center circle parameter must be ON.
Example with yellow center circle.
Displays or not the back knob cursor.
Example with this option ON and OFF.
Back knob cursor color.
The option draw-back-knob-cursor must be ON.
Displays or not the center circle.

When ON, the center circle is filled with plain color, empty when OFF.
Example with this option ON and OFF.
Center circle color.
Center circle size.
Example with small and large value for the yellow center circle.
version 6.0.241021
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