Thanks Torsten for your very good and exact answer i now use parallel to the preshutdownscript of mythtv your script in an light edited style if silence is detected your script kills vlc, mythtvfrontend and rhytmbox instances. Then my existing preshutdown script returns 0 so the mythbackend will shutdown the pc. its exactly what i wanted to do ;) thx ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user