In that stimulating muscle within a socket may create additional pressure within the socket that is disrelated to external forces operative on the socket, corruption of pressure measurements within the socket may occur from stimulation, even though negative pressure differential on the side opposing, or furthest from the stimulation area, is explicitly used so as to avoid this corruption. An embodiment of the invention provides removal from the total pressure measurement that portion which is known to be resultant of muscle contraction. This stabilizes overall system control through improving input signal quality. Other embodiments are described herein.
