The Grainstorm app with so many options I could right about, but the first things are first, the Grainstorm app is a sound manifulation app. It has 4 channels you can record on and on each you can change the sound on. After you have recorded a sound you enter the first menu. This first menu enables you to set the grain, speed and pitch of the sample. Then you move to a granulation menu with effects, then the inner and outer envelope. There are depth and cycles effects and on the next page there is a control and envelope selector as well as frequency and depth control. The next menu is a modulation menu, then we have a phase vocoder and winsize selectors and the final menu is a modulator. There are other sub-menus you can use and also an accelerator and deccelerator. You can double the speed or set it to half, as well as cutting a measure off. You can also mute channels and play only what you want at a time. This app is great for working with sound while not in front of a computer screen, even if the controls are hard to use and loading files comes only in the paid version.