With the increased number of input signals, we set a goal to build a prosthesis with the maximum number of controlled functions available. Six motorized components were identified. They included a prototype shoulder, a prototype humeral rotator, a microprocessor controlled elbow (elbow motor, battery, and controller), a wrist rotator, and a hand with both open/close and wrist flexion/extension. These components were integrated into a functional arm system with a highly flexible array of control inputs (fig 1B). Problematic cardiac interference was minimized by using electrodes custom modified to have a 60Hz high pass filter. This proved to be effective in reducing approximately 75% of the cardiac interference