node->add_property("Number", _number);
node->add_property("Name", _name);
/*
+ typedef std::list< boost::shared_ptr< Evoral::MIDIEvent<double> > > PatchMidiCommands;
XMLNode* commands = node->add_child("PatchMIDICommands");
for (PatchMidiCommands::const_iterator event = _patch_midi_commands.begin();
event != _patch_midi_commands.end();