This is a really good lib. Been playing with it all morning, really should be doing work on my other project, and I've had no problem playing files converted with:
$ sox inputfile -b 8 -r 64000 -c 1 -t raw outputfile
Good work on getting all this together, I bought an arduino with a few projects in mind, but never thought
I'd be playing music off of the thing. Keep up the awesome progress!