Mine occasionally makes sort of a car alarm warble type noise when slowing down in gear, usually when running in low rpms. Not sure if that describes it very accurately, but it's all I can think of really. It's not really loud or anything. At first I just thought it was harmonics playing with the engine noise bouncing around my helmet, but I've heard it several times.
Only thing I've thought of is that I haven't fully engaged the gear and it's just slightly in limbo, but I really don't know.
I think what your hearing is gear/chain whine-I noticed it in the first mile of leaving the dealer-no amount of chain lube- wheel alignment- checking chain slack or different engine oil did any thing--I have owned bikes that have made some noise like this but this bike just makes more noise than others and after 7,000 miles it's the same