Think of it this way…
When you listen to a song on the radio can you only hear the singer or one instrument? No! You hear a 'mix"
the same applies to playing with a rhythm track…you should hear both. But…may concentrate on one aspect more than another.
A few observations"
The banjo is loud because you play it loud…it can take some time but you can learn to play at different volumes. You might be amazed at how quietly some really great pickers play the banjo…Lloyd Douglas & Dana Cupp are two I’ve known for many years who come to mind right away.
It takes time to learn to really hear your own playing (really listening while you play)…adding in a play-along track is another step in the process and this also takes time to get used to. Your brain needs to have time to adjust to listening to more than one thing and “compartmentalise” what you are hearing.
You can practice this while not playing…listen to a favorite recording several times. Each time through pick a different element (or pair of elements) to concentrate on…you will still “hear” the rest of the elements in the recording, but you are concentrating on specific ones. For instance: you’re learning banjo and probably listen mostly to that…what are the Bass and Mandolin doing? Can you hear them through the whole recording? How does the guitar match up with the vocals? Is there a volume difference so one doesn’t drown out the the other or so one can sound more “up front”?
My normal mode of practice on a fiddle is to have the jam track on headphones quietly and play the fiddle live (no mic). This is the best way I’ve found to balance tacks for myself…other things may work better for you, but it all takes time and some experimentation.
Don’t be afraid to experiment with different methods of listening.
All this stuff can be hard for beginners and it takes time, patience, and practice to get used to it all. Hang in there, and enjoy the process! It only gets better with time…