Technology is provided for controlling one or more electronic devices networked in a multimedia system using a natural user interface. As described, the metal alkyl borohydrides are of the formula I or II. The interposer is ideally suited for use as part of a test apparatus to interconnect highly dense patterns of solder ball contacts of a semiconductor chip to lesser dense arrays of contacts on the apparatus’s printed circuit board. The device further includes a first signal decoder responsive to the first system for producing first signals for accessing a cell within said array. The first transistor is configured to control ON speed of the driver transistor.