SoundScaper from Music App Blog
"For experimental musicians and sound design fans, SoundScaper is as
close to a no-brainer as you can currently get. Perhaps not such an
obvious choice for the more conventional musician but, as a virtual lab
for weird and wonderful journeys into sound, SoundScaper is a joy and a
bargain to boot."
SoundScaper - Igor Vasiliev brings us sonic madness in an iOS music app