Hi,
What surprise: in the UCH parameters, we can select one of 2 choices of turnsignal folowing:
* long (factory sound)
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* short
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++
[edit] new "short" sound with normalized level, like the "long"

Mind sharing how exactly "we can select one of 2 choices for the turn signal",

And is there any other sound possible for the turn signal, because personally I dislike both of them.

I think only 2 sounds and no more.
Each is selectable with the service tool by dacia.