Don,
The SK760 and the WK6 are exactly the same engines except for the 76 key keyboard with weighted keys(although not hammer action) vs the 61 and the WK6 has speakers and the SK760 does not. There is also the SK880 which has 88 weighted hammer action keys. The SK880 feels like a real piano, where the SK760 is somewhere between a synth and a piano.
The WK8 is the same as the WK6 except it has 8 meg of battery backed ram to store samples that you load from disk vs 2 meg of sample ram in the WK6. The WK8 also has the vocal harmony option already inside the keyboard, where you have to buy and install the vocal harmony option for the WK6.
So, if you had a WK6 and you bought the 8meg option and the vocal harmonizer, you would turn the WK6 or the SK760(which can have the same options) into a WK8. The WK8 only comes as a "mega station" which means there is a hard drive installed stock from the factory, where the SK760 and WK6 are either with floppy disk drive only or you can order either one as a "powerstation" which means they come with a hard drive installed from the factory, including hundreds of midi files and hundreds of extra styles and sounds. The only other difference between them is that the center of the keyboard, around where the large square display is, would have a wood grain appearance on the WK8 and the WK6 and SK760 are charcoal grey in color.
Now, there is now a WK8"se"(special edition), which also includes a new chip which adds the piano sounds(as well as 31 other sounds) from the highly acclaimed Pro1 piano keyboard. Also, the "se" includes some new RASS (real audio sampled style} styles inside the keyboard as opposed to having to load these from the disk drive or hard drive.
I hope this helps solve the mystery of the different models available from Generalmusic. The hardest thing about this for customers to understand is that Generalmusic sells me the WK series and Peavey sells me the SK versions. I wish there was only one distributor so most customers would be able to get info about all generalmusic products from one source.
George Kaye
Kaye's Music Scene
Reseda, Ca.
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)