By saying that daisy's voice is "full of money," gatsby rejects the idea that he might be able to win her back by simply becoming very rich himself readers understand the musicality of daisy's voice reminds readers that he has the soul of the poet in him suggests that her wealth is a defining and intrinsic aspect of daisy's character

Gatsby suggests that her wealth is a defining and intrinsic aspect of Daisy's character.

What you can assume from someone having a "voice full of money" is that their wealth affects their being in a lot of ways, as deeply as their speech:

thanks to access to education and literature, she probably has a varied vocabulary;because she was brought up in a respectable family, she probably was taught to use decent language and does not say any vulgarities;she probably has a lot of confidence due to her high social status, and speaks in a poised, assertive way.

huh.,, what bro