Hi,
thank you alot for your answer! When clicking on Imoen's picture/avatar several times, she iterates through the German Baldur's Gate II Imoen-Soundfiles and a single Imoen-soundfile ("what do you want?") in English from Baldur's Gate I.
I installed a 2017-version of the BWS for the classic Baldur's Gate Trilogy. At the start, in Irenicus dungeon, you can hear Imoen playing single BG1 sound among the several BG2 sounds when clicking on her avatar / picture. Worse than that, this single BG1 sound is not in the default language.
I looked at the different mods that could have had an impact on the voices / soundsets, but now I am out of ideas. A hint where to modify components would be great. I attached my WeiDU.log to this post.
EDIT: Damn, the WeiDU.log did not make it somehow. I am going to upload it later, sorry!