Regulators - Uilleann Bagpipes Drones Regulators is an Android application developed by AppCordions that provides a tunable set of three drones and three regulators for Uilleann pipes in the most common keys of D, C#, C, B, and Bb. The app offers a choice of Lynch or Crowley-style drones and is a great educational tool for those interested in learning about playing the regulators or who already play the Uilleann pipes. It also allows users to practice the regulators by playing along with recordings in their music library. The Lynch drone samples are recorded from the developer's personal set, and Crowley drone samples are originally provided by Vinnie Kilduff. The app is easy to use, and the selected key is saved and used the next time you run the app.