V'ger's "theme"
In The Motion Picture, V'ger is often accompanied by a low synth sound, almost a "twang." I always took it for granted that this was a function of the score: that is, entirely non-diegetic. But it recently occurred to me that maybe this is what V'ger actually sounds like, in-universe. That the "twang" is diegetic and can be heard by the characters. I have no idea how to prove or disprove this hypothesis, but I welcome your thoughts.