MelodicFlow is a gem!
Really; I love it!
I’m very poor at keyboard, but I love jamming, so I always searched for a way to play solo notes in tune and Scaler 2 Keys-Lock + some DAW tools worked, but not perfectly and not always
I also searched for arranger VSTs, installed and demoed many, also expensive tools, and this gem appeared just today by accident 
Well, in Italy we say “meglio tardi che mai” (better late than never)
I quickly activated it, and jammed for hours using the set below
Scaler is used to send chords in the left area, and I played the solo in the right area using a couple of blues scales
and here it is Melodic Flow
Note: I could have used one only Virtual Pianist to have chords from Scaler and solo notes from my keyboard, but I realized that the volume of solo notes was lower than chords, so I preferred using a copy of Virtual Pianist to play notes, and this is why the routing is a bit more complicated