A processing system may include an array of input/output (I/O) devices (e.g., an array of microphones, an array of antennas, etc.) A device array control program for the processing system may provide a user interface for controlling the array of I/O devices. The user interface may include an array of objects representing the array of I/O devices, as well as a set of controls near the array of objects. The controls may include a right handle, a left handle, and a gain handle. The left handle and the right handle may be moved by a user to control which I/O devices will be used, and the gain handle may be moved to control gain for at least one of the I/O devices. Other embodiments are described and claimed.