Hello Toni,
Because Power LED Dim.
If the Checkmark 'power led Dims when audio filter is disabled' is disabled in the Miscellaenous Section in combination with
Audio Filter: Always Off [Power led is Off, thats right]
Audio Filter: Emulated A500/1200 and Always Enabled [Power led is Off too?]
If the Checkmark 'power led Dims when audio filter is disabled' is enabled
Audio Filter: Emulated A500/1200 and Always Enabled [then is Power led on too?]
PS: The LED Dim is a litte bit to Dark. Can you make a few Percent brighter? Or put optional to the Uae Config ini as [example] amiga_power_led_dim=65 (Brighter 0-100 dark)?
I think is not important to add a Gui Element for this. Only in the uae Config.