Good guess.
Too late! 
So yes with sample locks slots numbers are kept with flex or static, except flex recordings 1-8 becoming assigned to static slot 128!
Track default setting is respectively kept by static and flex (track 1-8 have slots 1-8 assigned by default).
Ex : if you change T1 static slot (default is 1) to 9 and change to a Flex, the flex slot will remain slot 1 (default).
If you change that flex slot to 5 and change to static, static previous setting is kept (9).
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