This iOS app is a sample manipulator, triggering a stuttering effect that works in tempo subdivisions. It is based on the repeater device by the Renoise tracker software.
This effect is achieved by having two separate playback headers moving through the sample and having one of them loop around certain sections of the sample depending on the button pressed. Once the button is released the loop header can join the position of the normal playback header and continue on until another button is pressed. A filter is also added as an extra effect, controlled by a slider.