Graham,
The WK3000 also has the SM storage card as the WK3500. I do agree that line outs are cleaner in sound then the headphone jack. Plus, you use regular cables (a left and a right 1/4" mono plug for each, like standard guitar cables). On the WK3000 you must use a stereo insert cable. One 1/4" stereo Plug (looks like the end of a headphone jack with 2 rings around it rather than 1) and going to 2 seperate 1/4" or rca" left and right plugs depending on what kind of inputs you are using.
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George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)