Click Space Lite is some kind of a glitch 5 track groovebox for the iPhone & iPod Touch. For each track you may assign volume, pan, gate, speed (pitch), attack and decay times. It includes 25 samples, and includes a master effect unit with LP distortion, digital lofi effect, and a short delay.
The interesting thing (which differs this app from other grooveboxes) is the shuffle editor. You may define overall shuffling pattern in addition to common beat pattern. So you could make some jazzy grace notes and non straight beats.
There is automation for pitch. You can set up it’s variation to bring more life into your beat sequence.