You enter the melody and let tonica fugata create the Jazz harmonies. It's as easy as this!
Above you see tonica fugata's Jazz harmonies. tonica fugata can then vary the composition with riffs etc. (below).
Being a Jazz musician you are not interested in "forbidden" parallels, but you need Sus chords, Maj7 chords and much more.
tonica fugata has a complete Jazz engine to allow for specific chords and harmonic changes.
Your Jazz compositions will sound authentic.