Heres all the info on the shield...its unfortunately limited along with any support which gets me mad...
I have actually moved on to another library to try if there are any different results. Im using this library: https://github.com/amperka/music-shield
And my code is as follows:
// File MusicPlayer.cpp
// For more details about the product please check http://www.seeedstudio.com/depot/
// Copyright (c) 2012 seeed technology inc.
// Author: Frankie.Chu
// Version: 1.7
// Time: June 10, 2012
// Changing records:
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
myplayer.begin();//will initialize the hardware and set default mode to be normal.
myplayer.setPlayMode(MODE_REPEAT_ONE);//set mode to repeat to play a song
myplayer.playSong("test.wav");//play a song named with test.wav
while(1);//If the mode is normal, it will stop when it finished playing all the songs in the playlist