The developer of the fantastic Borderlands Granular app make a great 50% OFF discount during Black Friday Sale. This app really worth the money because you get the best granular Synthesizer on IOS for such little money. If you search a tool for creating endless soundscapes from audio samples, this Granular Synthesizer must be your choice.
Borderlands Granular is available here: (9.99$ → 4.99$)
In this video, I used Borderlands Granular in a jam session