This instructable is just showing the optimal process for mounting the board. There are examples of use at http://blushingboy.net. Anyways I plan to publish some extra articles on how to make a simple music instrument and in how to make a small computer in the following weeks. Stay tuned!
Note: the pictures and soldering work for this instructable is by T. Olsson from 1scale1.com, thanks for the great job!
Step 1: The Tools
Step 2: Mounting the Pcb
Step 3: Where to Find Documentation
It will play whatever 8bit, 8KHz sound files you have in the SD card one by one.
You could also try out the work made for Smapler v0002, but taking into account that the Smapler v0001 is only mono: