Roy Witt writes in a message to Bruce Bilson
 RW> The external speaker jack. By using a circuit board already 
 RW> in existence, you can tap off the audio and start/stop the 
 RW> recorder at the same time with this circuit. 
Yikes!  That means that the volume control affects the level of the audio and 
you lose the speaker.  You also get any distortion and noise generated in the 
audio stages after the volume control.
 
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