lol i said Genjutsu Is Genjutsu: Dosent matter how it's delivered.
for example: I kick a ball at you, Then I Throw a Ball at you, The same thing Happened Right, The only thing diffrent was How it was delivered, But the Outcome and result was Exactly the same.
So once again Nagato most likely isnt immune to Genjutsu.
Even jiraiya's Sound Genjutsu Turned into a Visual setting. It showed Pain inside of some Cube, Pain saw himself inside of a cube, basically thats Visualisation since PAin had to "See/Visualize" that he was inside of an cube, and he couldnt even get out.
An actual sound genjutsu is Kin's which she used on shika
And plus no where does it say Pain is immune to visual genjutsu. It woul'dve BEEN said that. So until it sais Rinnegan is immune to visual genjutsu, Its not until kishi states that somewhere atleast.