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....and didn't bother to explain in the blue Reference Guide." Nothing new there then
Technics made superb keyboards but the User Manuals were considerably lacking in detail - to say the least. However, our good friend Alec did a great job with his supplementary manuals.....
On the question of DE, NE I would suggest, as others have, that DE is Digital Effect, NE is No Effect. If you observe the LED associated with the PART EFFECT/DIGITAL EFFECT button, when a sound includes the 'DE' tag, then the LED is lit and if the tag is either 'NE' or no tag, then the LED is not lit. With regard to the Organ Bass DE, although the LED is not lit when this sound is selected, there IS a subtle Digital Effect, in the form of a slow Rotary Speaker! Press, for example, the C4 key and switch between Organ Bass NE and Organ Bass DE (release the key between switching). I would suggest that this may be a minor bug in the software, in that the LED should be lit, but the link to operate it is just missing in the software routine, for this particular sound..........
With regard to the NV sounds, I think this indicates a sound with No Vibrato