OK, here is what I know about it.
I believe you have to 'UNLOCK" the specific option in global in order to 'OVERWRITE" a factory preset. Also, you can just write it to a user location.....
Also, No I do not believe you can boot up to sound mode. I have not seen an option for that. So, why not e-mail KORG to ask for that feature in a future release?
OH, I just downloaded & played some with OS V2.0... VERY NICE INDEED!
Have fun,
Lee
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Lee S.