Numerical Audio tells us that Octachron is a flexible 8-Track Midi Drum Sequencer with rich modulation and sequencing capabilities. They say that it Works Standalone or as AUv3 AudioUnit in a DAW on iPad.
Standalone or AUv3 AudioUnit
1-32 steps with flexible clock divider and custom time signatures
8 mutable tracks with flexible length
Up to 8 chain-able patterns
Swing with flexible swing grid
Save and restore your presets
Parameter lock velocity, trigger probability, ratcheting and CC