Abstract: A disc jockey controller for a handheld computing device is disclosed. The controller includes a body with a top surface. A cradle is configured and arranged to hold a handheld computing device in a desired orientation. A main output configured and arranged to be electrically connected to a handheld computing device. A left platter control and a right platter control are provided on the top surface of the body. The platters are rotatable and pressable to generate control data for the handheld computing device. A DJ application running on a handheld computing device is configured and arranged to use a communication protocol to receive control data from the controller. The DJ application is further configured and arranged to use the control data to apply special effects and to manipulate the first audio source and second audio source.

Abstract: A controller for a tablet computing device is disclosed. The controller has a body having a number of control surfaces. A dock is on the body and has an L-shaped groove configured and arranged to receive a tablet computing device docked therein. A microcontroller is configured and arranged to detect interactions with the control surfaces and transmit the interactions to the tablet computing device. An analog output is configured and arranged to receive audio signals from the tablet computing device whereby interactions from the control surfaces are processed by the tablet computing device into audio signals for transmission through the audio output.

Abstract: A controller for a handheld computing device having a music-oriented program operating thereon is disclosed. The controller includes a control surface configured and arranged to be manipulated by an operator to generate a control input. Further included is a circuit configured and arranged to detect the control input generated from the control surface and transmit the control input received from the control surface to the music-oriented program operating on the handheld computing device.