Ok - here I’m back again - thank you all for your replies. Referencing via filename works.
Therefore the Sound Files have to be copied via “Build Settings > Build Step > Copy files” an NOT via Drag&Drop into the left column of the XOJO IDE.
Looking into the .apk-File in the res-folder, it seems to me that In case of Drag&Drop XOJO changes the filenames to something like AA.mp2 …
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