I think the Adafruit wav shield is quite different. The ones that I have came with only one snippet of sample code and an instruction booklet that was poorly translated and kind of difficult to follow. I have been working through a specific problem with 'Grumpy_Mike' on a separate thread (trouble getting started with Wave Module - Audio - Arduino Forum) but was hoping to find others who had worked with this particular module so I could get a better sense of what the code that I couldn't recognise was doing.