I play bass in a few bands, rhythm is tough but learnable. Easiest way to get good timing fast is:
Listen to the music you want to play first. If you only have the sheet music, Musescore is a fantastic software to hear sheet music.
Keeping the rhythm that your heard in mind, play what you want to play. Once you get it, it will feel right. If not, play the music VERY slowly, slow enough that you can do it quite easily. Set a metronome to this slow speed, then increase the BPM by 5. Find your limit, back off the BPM slightly, then practice at that speed until you can nail it.
I cannot stress this enough, record your playing! Knowing how you sound is so so so helpful, it lets you hear what your playing without the distraction of actually playing. Super helpful to see exactly how and where your out of time.
As a trumpet and a bassist myself, an amazing detial is the performances themselves. All the playing fits the situation and the characters perfectly if you know what to listen for. This is most apparent in the scene where the saxophonist gets kicked, her playing is super uncetian and shakey. Fav music anime hands down
My mixing studio monitors, I haven't properly gotten into mixing yet.