void MonitorManager::updateAudioIcons()
{
    Monitor *m = static_cast<Monitor *> (m_activeMonitor);
    if (!m) return;
    int volume = m->render->volume();
    m_muteAction->blockSignals(true);
    m_muteAction->setChecked(volume == 0);
    m_muteAction->blockSignals(false);
    m->mute(volume == 0, true);
}