As you can see, Patterning is a drum sequencer that has a very different UI from your typical sequencer. Vaguely resembling Loopseque, but clearly deeper, Patterning looks like it should be fun.
Patterning is a sample-based sequencer, which will have full Audiobus and Inter-App Audio functionality, as well as 'Open In' functionality from AudioShare (yes!), Dropbox, iCloud Drive, and iTunes file sharing for you luddites. The app will also feature MIDI Clock Sync, as well as independent assignments for each track's MIDI output.
I'm a big fan of all the apps that the developer Ben Kamen has created. Knowing his history, I suspect that Patterning will be an easy recommend once it is released, which is scheduled for this summer. Stay tuned for a review!