Have you experienced this?
also known as "microtonal"
(microtonal keyboard piece from 1555)
(31 tone organ piece)
(Microtonal trills in the solo line)
turkish arabic, indian, bulgarian and balinese music is a wealth of microtones, as well as any non-autotuned vocal part: the voice naturally slides between notes creating microtonal inflections, something I've been trying to capture in this flute piece I'm writing...
also pic related is a great example of microtonal writing.
fine tune your notes.
every DAW should have a fine pitch or channel pitch that you can automate. Its measured in cents. 100 cents is a semitone (1 fret) 200 cents is a whole tone (2 frets). anything less is microtonal.
so you could choose a microtonal scale that had:
C (Sharp 25 cents)
F# (flat 25 cents)
then just stick to that scale for your piece. or change to a new scale.
the other option is just to microtonally tune random notes to you ears content