In the first interface Piano roll, I found it interesting since it is kind of similar to the drum pad interface, but here I can change the pitch of each note by clicking on the tabs. I can also add drum sounds to play with the piano sound at the same time to generate a melody with harmony.
The second interface Circle of fifths, it provides the circle to change the pitch of the notes which looks like a palette. Users can also change the pattern of each piece which are different in melodies. BPM can also be changed by clicking on the button below.