a processing part configured to provide said signal input by {HEAD ~ said external input unit} to said {TAIL ~ device} and configured to provide to said external output unit, in real time, a signal having a same contents as said signal being input by said external input unit, wherein 
to
a processing part configured to provide said signal input by { HEAD ~ said external input unit } to said { TAIL ~ device } and configured to provide to said external output unit , in real time , a signal having a same contents as said signal being input by said external input unit , wherein
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH