Yes the key must be defineable.

These tools are usually there to help in the full progression writing process.

So for example a typical 1, 4, 5 ( and then what for the pre chorus?) well let’s try a ii,V,iii,IV progression or perhaps to find a chord that goes well with the melody line. (There might be 6 alternative chords that contain the melody movement)

They are very helpful for guitar players or less formally trained musician that relay on their ears. (Like me)


Studio One (latest version), Win 11 23H2 , i9 -10940X 3.3 GHz, 32GB Mem, a 4K 40" monitor, PreSonus Studio Live III Console as interface/controller. secondarily test on Reaper, Cakewalk, and S1 on Surface Pro 3 Win 10 (latest versions).