Startup sound is put behind the ChromeVox.

chrome/browser/chromeos/login/login_display_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/login_display_host_impl.h"
 
 #include <vector>
 
 #include "ash/audio/sounds.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 465 matching lines @@
         auto_enrollment_controller_->RegisterProgressCallback(
             base::Bind(&LoginDisplayHostImpl::OnAutoEnrollmentProgress,
                        base::Unretained(this)));
   }
   return auto_enrollment_controller_.get();
 }
 
 void LoginDisplayHostImpl::StartWizard(
     const std::string& first_screen_name,
     scoped_ptr<base::DictionaryValue> screen_parameters) {
-  startup_sound_honors_spoken_feedback_ = false;
+  startup_sound_honors_spoken_feedback_ = true;
   TryToPlayStartupSound();
 
   // Keep parameters to restore if renderer crashes.
   restore_path_ = RESTORE_WIZARD;
   wizard_first_screen_name_ = first_screen_name;
   if (screen_parameters.get())
     wizard_screen_parameters_.reset(screen_parameters->DeepCopy());
   else
     wizard_screen_parameters_.reset();
   is_showing_login_ = false;
@@ skipping 665 matching lines @@
   scoped_ptr<locale_util::SwitchLanguageCallback> callback(
       new locale_util::SwitchLanguageCallback(
           base::Bind(&OnLanguageSwitchedCallback, base::Passed(data.Pass()))));
 
   // Load locale keyboards here. Hardware layout would be automatically enabled.
   locale_util::SwitchLanguage(
       locale, true, true /* login_layouts_only */, callback.Pass());
 }
 
 }  // namespace chromeos