ML Delay is Grayed out on MK4 with software 9.01.
edit: If the ML is grayed out and you have DSM module 2.0 or higher AST needs to be in the menu but does not have to be switched on just present.
If AST does not appear then the DSM FEP and DSM DSP software are to old
This is seperate from the H8 Software we normally talk about.
My TV has 9.01 but the DSM module sw is 4.23a and 4.19 which is to old for AST to be shown.