The Teenage Engineering OP-Z really shines once you load her full of your own samples! (Download them at: http://natecroft.com)
I grabbed my Mininova and made some quick patches and see what new sounds I could get going with the Z.
I'm running this in to the iPad via a Line6 SonicPort VX into the AUM Mixer app, which is amazing. You can save your MIDI environment along with your mixer in and outs/buses/FX/etc... I've added Audio Damage's Quanta and EOS Reverb and AudioKit Synth One to test out adding tracks from the OP-Z.
If you want some fresh sounds for your OP-Z or OP-1, you can download the ones I used here: