Native Instruments picked Monday to roll out both a small, lower-cost option for its digital DJ hardware and an iOS app to complement the set. The Maschine Mikro is about two thirds the size of its larger sibling and has a single display and a master controller that can be reassigned on the spot. It still preserves the 16 drum pads and gets access to the full suite of feature tie-ins with the Maschine desktop app.