means for transmitting said effects observable command when the corresponding one of said plurality of {HEAD ~ assignable user actuated switches} or {TAIL ~ keys} is actuated 
means for transmitting said effects observable command when the corresponding one of said plurality of { HEAD ~ assignable user actuated switches } or { TAIL ~ keys } is actuated
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH