This site was set up as I am a massive fan of the Sansui WS-X1 tape machine and found very little information about it on the net.
The WS-X1 is a 6 track cassette recorder with a separate mixdown deck included. It has an 8 channel mixer and built in reverb to boot. This design is unique and the only 6 track cassette recorder invented. This fact I think is special.