Nice and Simple, and very nice start, I like the way it slides up
I hope your going to add more to it? like say the ability to record a small 5 second sequence. then after that maybe the ability to have that 5 second sequence play over and over in a loop so you can build up on it
you could make a rather powerful midi sorta tone tool here
Just thought id jot down some things that you could add. easiest to hardest
1) Chord mode (broken and full)
2) Record a sequence of notes.
3) Play Back sequence of notes.
4) Save sequences
5) record two or more sequences and have the ability to play both back at the same time to create even more in depth music