Steps to the next function in a fixture attribute. So if you have function red, green and blue it will step through these. It will move to the previous funxtion in the list. If no more functions exist it will perform no function.
Namespace: Programmer.Editor.Fixtures
Void PreviousAttributeFunctionFast(Int32)
http://[ip]:4430/titan/script/Programmer/Editor/Fixtures/PreviousAttributeFunctionFast
wheelIndex: The index of the wheel linked to the attribute you want to control.