I know why there's a problem, but fixable
I really like it. And it works very well when you are performing more "instrumental" notes instead of "beats." What I mean is, when you RELEASE the key, it works fine. I get that, but in terms of lining that up with beats?
No. That's not exactly "rythmatic." Rythm is about timing of hitting the note, and releasing is a totally different thing. It throws you off and you can't ever hit the notes exactly on beat because of that. Meaning -- in order to play this correct, you have to be early with every note.
That's a bad thing. But I imagine, easily fixable. Just change the event to when you press the key DOWN and all is done. The scoop thing I don't understand if it makes ANY difference, because it just proves "hey, I can hold down this key for 5 seconds before a note comes up, but not if accompanied by 8 other ones in a row - I'm dead when that happens." I can't deny it's bad, so I do still like it. Just... bad tendency to have to hit a note earlier than needed.
I'm a drummer, any musician knows coming in early or late sucks... or blows, whatever your gender is.