Love and Mercy Question

[Surfer]

In the Movie when Murray Wilson came in and the Beach Boys were listing to I love for the sun and Brian goes back into the Recording booth and puts on the ear phones he ears voices but what voices is he listening to

[jiggy22]

To me at least, the voices sound like they're sampled from the "Moaning Laughing" skit from the SMiLE sessions, but I doubt that. If I had to guess, they were probably just random noises recorded by actors specifically for the film.

[Lee Marshall]

Does it not suggest that there were [and likely still are] 'triggers' which would set off the voices in Brian's head.  Murry was a trigger-man.  That 'love' fool is one too.  Pretty sure NO ONE else would have heard those voices.  Even if they were right there beside him.

So?  Brian wasn't listening to them.  He was, sadly, just HEARING them.