Introduction - If you have any usage issues, please Google them yourself
It is the four track stereo recording by means of encoding specific synthesis is two channel, to the left and right channel (L) (R), middle channel (C), surround channel (S) of the 4 signals, after encoding for the synthesis of LT, RT double channel signal playback when the decoder will have encoding two channel composite signal LT and the reduction of RT to encoding the left and right, surrounded by four mutually independent signals and stem, enter the left speaker, right speakers, speakers and surround speakers after amplification.