Games wise 4.1 is most stable, so I'd stick to 4.1 based builds for performance. Mic doesn't work on 4.2 or 4.3, so calling in hangouts will need 4.1 anyways also.
If all rovio games do it then it may be an issue with them, but 4.2 and 4.3 don't run that we'll so I'd blame the Rom first.
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Thanks for the TIP. I'll go with the 4.1 Sosei II then
You're the man!