In the second screenshot you’ve posted, tap on the radio station actually playing (below left corner) -> tap on the big ‘star’ icon in the middle of the next screen you’ll see, you will notice that the appearance of the star will change …
If you’ve added stations there that would explain why you’re seeing presets listed, perhaps try removing them from the tuner website and if there are none then the presets won’t be visible/required.
The Musos from memory have 5 presets (the first 5 in the list) available via touch screen on the volume knob, perhaps these are hard set in the menu and cant be made to disappear so if no station selected it just remains blank?
The NDX2 shows “Radio” instead of “Presets” - at least it does on my NDX2. Tapping “Radio” then shows the stored stations. Not really any different apart from the word “Radio” rather than “Presets”.
My assumption was that the reference of full retard had to do with setting the ignition timing of an internal combustion engine. The act in which one is advancing or retarding the timing of the exact point of ignition as it relates to the compression of the air/fuel mixture within the combustion chamber to maximize the engine’s output. This reference predates the use of the word in the context of any negative slang.
Surely I am not the only gearhead that is also into listening to music?
In your original picture of your NDX screen, it doesn’t look like you’ve got the iRadio input selected which is why you don’t see the Presets. I suspect you can’t remove that option from showing at all. Better to fill them with stuff you listen to.