Hi @Karsten_Harazim (nice to see you here, by the way!) you can see the development history of @OSBeehives audio sensing on their forum:
http://community.opensourcebeehives.net/t/research-audio-sensors/111
and it looks like there will be some updates this week too:
http://community.opensourcebeehives.net/t/osbh-audio-sensing-white-paper/323
But just searching for ‘audio’ on http://community.opensourcebeehives.net should bring you up to speed pretty quickly.