I play in a couple of swing bands and although my reading is now good, when i am presented with just chord sheets or a passage with chord progression I find the opposite occurs, rather than being overwhelmed by the amount of choice open to me, i freeze into a predictable cycle of arpeggios rather than a nice walking pattern, i am aware of the use of chromatic approach notes but seldom use it to good affect. But i do know this is my weak point and try to work on it. That said i do listen to what other sections are doing and play sympathetic phrases that supports the general tune or phrases being played elsewhere. This means my playing fits in, so ticks most of Dads boxes. know where it is important to be doing the right thing, the start and end of phrases and approaches to key changes etc, you can often get away with things elsewhere. A good jazz bass player is like a guide dog, guiding brass soloists around the piece so they don't have to think, where am I , what's he at now your choice of notes tells them what chord tone you will be playing in two beats time ah we are at the Verse, thought so. So when they have been enjoying a 32 bar solo and think did we do the repeat, ah yes the bass player sounds like he is building to the key change in the second time bar. phew I'm glad he is playing for us tonight, I don't have to think.
I just wish that was me i was talking about, Its a long journey this bass playing lark.