So here is what I mean:
1. Even though I have given names to two of them, only one OBS input shows up in Jack.
2. Both streaming and recording let me select an audio track (1-4), but I select audio with 5 pulldowns. (Two are only soundflower type devices; three others add in the microphones)
3. Nothing that I can find lets me assign audio sources to audio tracks.
4. The menu item you mentioned -- edit -> advanced audio -- is always disabled.