P&W Bass players that sing lead, how do you control the songs volume/dynamics?

What I mean is that the loudness, softness, interesting hits/snaps/riffs/melodies, are never heard by the bass. Its done by everybody else, and the bass provides, well, the bass. As in it certainly adds a lot of weight to a part, but it doesn't bring in the interest.

You can argue that bass certainly provides the loudness to a song, but its something everybody builds on and therefore only goes so far in dynamics.

As for leading while playing bass, do you basically give all responsibility for dynamics to your team? How complex does your playing get rhythmically?

The reason I ask is in the P&W song recordings, while the swells, melodies, and over all dynamics can be pretty far reaching, the bass really doesn't contribute much the moment there are more instruments playing.

I can only hear its impact when there is a particularly soft part of the song and barely anything is playing, and the bass stops. Then the song ramps up a little but only the bass is added in. At that point I can feel its weight and how the song feels like its gonna get more exciting. But then the moment everything else comes in, the bass is regulated to just...well...the bass.