Newbie - How to skip backward in steam?

Hi,

   I'm working on the Apple Newton port of MAD.  How do you get the  
player to skip backward in the stream?  I can skip forward using  
mad_stream_skip, but it won't take negative offsets.  I tried calling  
mad_stream_buffer again to restart the current buffer playing from  
the beginning, but this causes the sound to stop (this may be because  
of the way the Newton sound architecture operates - if MAD is unable  
to decode anything, the buffer back to the NOS is empty, and it shuts  
down the sound codec).  Can I just set stream->this_frame and stream- 
 >next_frame directly?  What does stream_sync do?

Thanks,
Jim Witte

[email protected]