setting ALSA_CARD from /etc/bashrc

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OK, this is more of a bash/distro question but I hope someone can help 
me out.

I need to set ALSA_CARD globally.

I've added a line to /etc/bash.bashrc that sets ALSA_CARD depending on 
the value of $DISPLAY.

if [ ${DISPLAY+1} == 1 ] ; then
        [[ -f /etc/asound_card.conf ]] && . /etc/asound_card.conf
        export ALSA_CARD=`eval echo '$SOUND'$(echo $DISPLAY | cut -f2 
-d: | cut -f1 -d.)`
fi

Now this works fine if I open a terminal window and run my apps.  But 
apps started from the menu don't have ALSA_CARD set.  This apparently 
happens for gnome as well as xfce4.

How can I set ALSA_CARD globally?

--Yan

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