Nice job. Quantizing to a given scale/signature controlled through touch or gestures to glide and create ambient textured soundscapes is actually a pretty well-explored space. I've seen some neat MPE-style ones that let you emulate aftertouch through haptic pressure and vibrato by wiggling your finger back and forth.

It’s a very popular genre of music apps on the iPad, since the larger screen lends itself well to this kind of musical performance. You should definitely check out apps like MorphWiz, GeoShred, etc. if you’re interested in this kind of thing.

Thanks! I looked them up. MorphWiz looks amazing. I have no iPad but the videos look neat. I might have oversold my innovation. I have been thinking about haptic pressure as you say, this is the weakness on most devices. I am thinking about maybe using drawing devices for power users. Hey even on a drawing tablet with no display, it could be interesting to try out.

In any case, I did try my app on tablet and it feels great (and responsive on cheap CPU). Forgot to say, that there is a tremolo feature and which is key to expressiveness.

Thanks for the comment, appreciated!