Originally Posted by Teddy Ray
dither/resample should be the final step.
never dither twice and always dither as the very last step
This is incorrect, dither should theoretically be used whenever there is a truncation of the sample stream..
However the source may already have enough noise on it that the signal will already be decorellated from the noise, in which case dither may have no beneficial effect (you're trying to randomize something that's already random by adding some random noise).
So assuming the Korg developers know what they're doing, the answer to the OPs question is theoretically yes, you priobably should be using dither. In practice it may make no audible difference.
I'd agree with the higher rate though, if you have the disk space and processing power it won't hurt, and depending on various factors, it could help.