Sliver is an iPad App by Alex Matheu, the Developer behind Glitchbreaks.
The core of Sliver is the 4 real-time resizable clips (slivers) that can be moved around the waveform. Each sliver has it's own channel with independent volume, pan, filter, and window size.
4 XY Pads are dedicated to the four channels and 4 more are assigned to effects to mangle and twist the sound.
You can automate everything, and easily create new and exciting sounds.