Cubase chord/arranger track, generate song starters (chord progressions) with non-AI :)
Cubase is able to highlight piano roll rows not just scale but chord-based too (and display chord-non chord-out of scale chord with different colors) using it together with the arranger track makes it a really nice music theory hacking scratchpad, so can be used creatively too (not just linearly) especially nice because track versions also can be used on chord track too (I've reused the chords of another track on the video for ex. just in different order and with diff. notes in it)
because just seen the InstaComposer magic ... and the RapidComposer comment too, so especially in trance which doesn't use fancy extensions just tons of sus ones ... happy music theory hacking ... errr chord hunting :)