switch (wantedRouting)
    {
      case AudioSystem::DEVICE_OUT_ALL:
          routing = String8("FM_routing=DEVICE_OUT_ALL");
          break;
      case AudioSystem::DEVICE_OUT_EARPIECE:
          routing = String8("FM_routing=DEVICE_OUT_EARPIECE");
          break;
      case AudioSystem::DEVICE_OUT_SPEAKER:
          routing = String8("FM_routing=DEVICE_OUT_SPEAKER");
          break;
      case AudioSystem::DEVICE_OUT_WIRED_HEADPHONE:
          routing = String8("FM_routing=DEVICE_OUT_WIRED_HEADPHONE");
          break;
      case AudioSystem::DEVICE_OUT_WIRED_HEADSET:
          routing = String8("FM_routing=DEVICE_OUT_WIRED_HEADSET");
          break;
      case AudioSystem::DEVICE_OUT_ALL_A2DP:
          routing = String8("FM_routing=DEVICE_OUT_ALL_A2DP");
          break;
      default:
          routing = String8("FM_routing=DEVICE_OUT_ALL");
    }