- char buf[32];
- snprintf (buf, sizeof (buf), "%u", _channel);
- root.add_property (X_("channel"), buf);
- root.add_property (X_("origin"), _origin);
+ root.set_property (X_("channel"), _channel);
+ root.set_property (X_("origin"), _origin);
+ root.set_property (X_("gain"), _gain);