Sorry I dont see how upstream is going to fix this, however there is a
very quick fix for this.

Index: gnome-control-center-3.4.2/panels/sound-nua/gvc-mixer-dialog.c
===================================================================
--- gnome-control-center-3.4.2.orig/panels/sound-nua/gvc-mixer-dialog.c 
2012-09-18 14:54:02.686384033 +0800
+++ gnome-control-center-3.4.2/panels/sound-nua/gvc-mixer-dialog.c      
2012-09-18 16:16:52.255026778 +0800
@@ -509,6 +509,8 @@
                 /* Make sure we do not unmute muted streams, there's a button 
for that */
                 if (volume == 0.0)
                         gvc_mixer_stream_set_is_muted (stream, TRUE);
+               else
+                       gvc_mixer_stream_set_is_muted (stream, FALSE);
                 /* Only push the volume if it's actually changed */
                 if (gvc_mixer_stream_set_volume(stream, (pa_volume_t) rounded) 
!= FALSE)
                         gvc_mixer_stream_push_volume (stream);
Index: gnome-control-center-3.4.2/panels/sound/gvc-mixer-dialog.c
===================================================================
--- gnome-control-center-3.4.2.orig/panels/sound/gvc-mixer-dialog.c     
2012-03-05 22:04:55.000000000 +0800
+++ gnome-control-center-3.4.2/panels/sound/gvc-mixer-dialog.c  2012-09-18 
16:16:17.238853143 +0800
@@ -784,6 +784,8 @@
                 /* Make sure we do not unmute muted streams, there's a button 
for that */
                 if (volume == 0.0)
                         gvc_mixer_stream_set_is_muted (stream, TRUE);
+               else
+                       gvc_mixer_stream_set_is_muted (stream, FALSE);
                 /* Only push the volume if it's actually changed */
                 if (gvc_mixer_stream_set_volume(stream, (pa_volume_t) rounded) 
!= FALSE)
                         gvc_mixer_stream_push_volume (stream);

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/986692

Title:
  Unmutting sound effects using the slider doesn't work

Status in GNOME Control Center:
  Fix Released
Status in “gnome-control-center” package in Ubuntu:
  Fix Committed

Bug description:
  Sound--> Tab "Sound Effects"
  After bringing alert volume to the minimum none of the selected alert was 
working. Everything else is ok. Sound in other places is perfect.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gnome-control-center 1:3.3.92-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  CasperVersion: 1.312
  Date: Sat Apr 21 21:10:21 2012
  ExecutablePath: /usr/bin/gnome-control-center
  LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/gnome-control-center/+bug/986692/+subscriptions

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