XPost: comp.mobile.android   
   From: bobnospam@gmail.com   
      
   I have been trying to get my Galaxy S9 to record FM radio programs.   
   NextRadio is the only app that I have gotten to work to receive FM using   
   the internal tuner, but it has no record capability.   
      
   I have the app Audio Recorder loaded, which works for a headphone/w   
   microphone well, but does not work with the Recording Source set to   
   internal audio with the NextRadio app, which I had hoped would work.   
      
   So, I am trying to make a cable from a 4 wire TRRS audio cable that can   
   plug into the phone, acting as the FM antenna, and feed reduced signal   
   from the audio outputs from the phone into the microphone signal input   
   to the phone.   
      
   I used a 29.5 inch length of the audio cable with the TRRS male plug at   
   one end, and built the following circuit at the other end, hoping the   
   would signal the phone that it has earphones and a microphone connected   
   to the phone so Audio Recorder can record from the back fed headphone   
   output.   
      
   https://source.android.com/docs/core/audio/latency/loopback   
      
   Unfortunately, this is not working. It seems the phone is not detecting   
   the signal coming in as an external mic, and picks up the intern phone   
   mic instead. My understanding is that the phone looks for the impedance   
   of a mic to make the switch, and it seem the resisters in the above   
   circuit is not causing that to happen.   
      
   If anyone has knowledge about what the phone expects to make the mic   
   switch, I can definitely use some help. A record app that can force   
   external mic switching could be a solution. A FM radio program that can   
   use internal audio or that has built in record function that will work   
   on the S9 could also be my solution.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)