Sorry to nitpick, that’s not an RCA machine, it was made by the Victor Talking Machine Company prior to when the company was bought by RCA circa 1929. And the record is shellac, not vinyl.
The record you are playing was acoustically recorded. In other words, the performers played and sang into a giant horn. They typically have a thin, tinny sound, with virtually no bass. Around 1925, they started using electrical recording (microphones), and the sound on them is much better.
You probably need to rebuild the reproducer (new gaskets). Parts are readily available.
No worries.
I hadn’t put anything through Vegas or even turned on the GH4 in a long time.