Seeing the videos it seems to me that it is perfect to build up complex sounds in a easy and intuitive way. Also having built in functions to make expressive playing easy and lastly something that I have only seen in one other application called Otoone ( for free and no publicity and worth checking out, and yes there is some virtual instruments using the same concept ) that is that you have the screen for playing with the twelve tones laid out horizontal and four octaves vertical it does make it easy to reach each note and change octaves easily actually it strange that you have not seen this in more applications. Because it works really good on smaller screens in comparison with the piano keyboard which does not allow more than an octave of accurate playing on smaller screens.
Well just download Otoone and try this type of layout for yourself... as that is a nice but a limited thing and then we play the Grantophone when it comes with all of its sound shaping options in addition?
Otoone ( not Grantophone )