I think wedrifid is probably talking about the licensing of the text-to-speech engine he used, rather than mp3, since if mp3 licensing is the problem the files can be easily converted to another format.
Oh. I understand now. I've tried a few text-to-speech engines and AT&T Natural Voices sound the best to my ears. I will find the terms of use and pricing for that.
I can drive and listen, but I can't drive and read! The same is true for most kinds of exercise.
If you are in my situation - wanting to read the sequences without having enough time - feel free to download these audio files for your smart phone or MP3 player.
My vision is to build a podcast feed or downloadable MP3 repository of all the major sequences. The files I have now are not organized enough to scale out to hundreds of posts, and some of the artifacts of text-to-speech could be reduced with the right pre-processing. Before I spend more time on this, I want the right tools and process in place.
Any ideas on how to to proceed? Would you like to help? How should I publish these files?