controlling a pcm audio stream

[David Banning]

I am trying cwtext which creates a more code pcm stream. It works if 
I simply take the file and dump it to /dev/audio like;

cat pcmfile > /dev/audio

but I would like some kind of control, like slowing it down.
The pcm audio stream world is foreign to me. I would even be great
to create a mp3 file or wav file.

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