Logging GPIO data on MetaTrackr

Is there a way to log and save analog GPIO data on the MetaTrackr device?   I am trying to log microphone data over an extended period of time.  I have successfully streamed the data, however I need to be able to continue reading when the app is closed.  I have found information about logging the digital pin changes, but I need the analog signal from the microphone. 

Any suggestions?


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