How about the following change?  It saves all mixer values at
the shutdown stage and restore them at the boot stage.

-- 
TAMURA Kent <kent2002@hauN.org> <kent@netbsd.org>


Index: mixerctl
===================================================================
RCS file: /cvsroot/basesrc/etc/rc.d/mixerctl,v
retrieving revision 1.4
diff -u -r1.4 mixerctl
--- mixerctl	2002/07/16 03:24:24	1.4
+++ mixerctl	2002/10/11 04:45:20
@@ -5,21 +5,34 @@
 
 # PROVIDE: mixerctl
 # REQUIRE: mountcritremote
+# KEYWORD: shutdown
 
 . /etc/rc.subr
 
 name="mixerctl"
 start_cmd="mixerctl_start"
-stop_cmd=":"
+stop_cmd="mixerctl_stop"
 
 mixerctl_start()
 {
+	if [ -r /var/db/mixerctl.conf ]; then
+		echo "Restoring mixerctl variables..."
+		while read setting; do
+			[ -z "$setting" ] || /usr/bin/mixerctl -n -w $setting
+		done < /var/db/mixerctl.conf
+	fi
 	if [ -r /etc/mixerctl.conf ]; then
 		echo "Setting mixerctl variables..."
 		while read setting; do
-			[ -z "$setting" ] || mixerctl -n -w $setting
+			[ -z "$setting" ] || /usr/bin/mixerctl -n -w $setting
 		done < /etc/mixerctl.conf
 	fi
+}
+
+mixerctl_stop()
+{
+	echo "Saving mixerctl variables..."
+	/usr/bin/mixerctl -a > /var/db/mixerctl.conf
 }
 
 load_rc_config $name