Thanks ottischwenk,
That launcher (I installed Version 1.2 ICS though) shows me the developer options without tapping on the build number (or my previous tapping already had an effect but the Onyx layer had not shown it).
So I was actually able to select aptX for my BT headphone, but not aptX adaptive although my headphones support this codec. I tried it with two different models. Looks like the Tab Ultra C does not support this audio codec.
Unfortunately the developer options will not appear when I switch back to the Onyx launcher. I was rather looking for a permanent solution with the Onyx launcher since after my first impression I do not dislike this one but although it obviously lacks some things.
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