Psycho Flute (com.magickhack.psychoflute) on Google Play
Psychoflute is a physical modeling flute synth that uses the csound library for android as its synth engine. The interface is very simple, just you your fingers on the screen to make sick, brutal, psychotic flute sounds. The multitouch controls various parameters of the physiclal model to give you a great tool for making noise music.You can download the sourcecode and change to your heart's delight as long as you redistribute your changes, yes this is GPL, check out the source at githib, https://github.com/bredfern/PsychoFlute