Thanks a lot for listening and for reading !
I indeed wanted each track to have a distinct style for the kind of scenery I had in mind (like with "At Dusk" having that sense of calmness yet semi-exhaustion for what is yet to come), so I'm glad that it came through by listening !
For the fretless bass lines I used (not very surprising I think) the Jaco Pastorius preset on my Zoom B1XFour bass pedal (with some additionnal filters) because it felt just right for this kind of music with that "mwah" sound.
I actually haven't listened to the discograpy of Weather Report (with or without Jaco in the band, I should do so at some point), only Jaco's solo album which is very influential for me for fretless bass playing, I also had in mind Jim Matheos (the guitarist from the prog metal band Fates Warning) Away With Words solo album for the fretless bass lines style and use in a guitar driven environment.
Thanks a lot for your comment !