Williams, T. Walley, III2011-10-032011-10-031995From "MEC 95," Proceedings of the 1995 MyoElectric Controls/Powered Prosthetics Symposium Fredericton, New Brunswick, Canada: August, 1995. Copyright University of New Brunswick.https://hdl.handle.net/10161/4877When it is not possible to control two devices independently, mode selection schemes are used to shift one good control source like two good myoelectric sites so that two or duet devices can be controlled. The Boston Elbow II, the Utah Artificial Arm and, Otto Bock 2-Channel and 4-Channel controls all use simple mode selection. Selection schemes may be operated by the signals themselves or by external switches. They may revert to a default state, to a ready state or they may cycle through states. Liberty Technology VariGrip circuits permit practitioners to apply mode selection to devices from many manufacturers of wrists, elbows and hands