boost::mutex::scoped_lock lm (_mutex);
node->add_child("AudioGain")->add_child_text(raw_convert<string>(_gain));
node->add_child("AudioDelay")->add_child_text(raw_convert<string>(_delay));
boost::mutex::scoped_lock lm (_mutex);
node->add_child("AudioGain")->add_child_text(raw_convert<string>(_gain));
node->add_child("AudioDelay")->add_child_text(raw_convert<string>(_delay));