Just a simple music scales displayer ( major/minor scales currently avalaible), with a simple piano's keyboard and a piano roll for displaying keys :
Screenshot/video here (there's no lag ) :
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Download it here : https://tiplanet.org/forum/archives_voir.php?id=3201187
It includes also a basic (without any AI inside) melody randomizer based on the current scales you've selected
So far, here's the first version, if you've have any question, just post a comment
Have a nice day!