Well, I don't think you want background sound - you want a one-off embed.
Try this:
http://www.amdragon.com/cgi-bin/www...st&Number=2377&page=0&view=expanded&sb=5here's how I did it:
#do_markup:
$Body =~ s,\[ sound\]http://(.*?)\[ /sound\],< EMBED SRC=http://$1 AUTOSTART=TRUE LOOP=1 ALIGN=CENTER>,isg;
$Body =~ s,\[ sound\](.*?)\[ /sound\],< EMBED SRC=http://$1 AUTOSTART=TRUE LOOP=1 ALIGN=CENTER>,isg;
#undo_markup:
$Body =~ s,< EMBED SRC="(.*)" AUTOSTART=TRUE LOOP=1 ALIGN=CENTER>,\[ sound\]$1\[ /sound\],ig;
$Body =~ s,< EMBED SRC=(.*) AUTOSTART=TRUE LOOP=1 ALIGN=CENTER>,\[ sound\]$1\[ /sound\],isg;
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