[openfirmware] How to play a music with tone?

[胡松涛]

Hi everyone,

I want to make a small demo for Open Firmware to show that it can play a  
music.
the very basic is : play, pause, play
with play, I use tone . but, I can't find WORD for pause, where is it?

further more, I read some articles about midi file. It's a little  
complicated for me. So I want to finished the first tone-music first :)

PS: Are there some detail articles about Open Firmware handle with music?  
wav, midi, mp3 or event avi?