I just received this one after a brief search....great lounge music. Anyway, I have a couple other E. Light's that are marked as CD4 lps......this is obviously one of his (or the) earliest surround releases, (c) 1969 and it is unmarked as to type. Does anyone have confirmation on what the "4 Channel Stereo" is? My guess is that it is EV matrix. Nice cheesecake cover also, is that you QL? John