Vintage King Sonic. 4Channel Decoder 4Q-1000

[bigbillquad]

I came across this Decoder box on the Japanese Auction site, and what caught my attention was "KW-4" I have never heard of this type of decoding before, have anybody got an idea..
BBQ...

 

[Sonik Wiz]

I came across this Decoder box on the Japanese Auction site, and what caught my attention was "KW-4" I have never heard of this type of decoding before, have anybody got an idea..
BBQ...

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Another crazy esoteric piece of gear. I've never heard of King Sonic (and evidently neither has Google) but I bet KM -4 is King Matrix. Yet another variation of RM or EV.