Your question is still not clear. In a common FM transmitter, voice or music at audio frequencies is used to modulate the the radio frequency in the transmitter.
If your intent is to receive the Frequency Modulated signal then listen to the audio you might want to separate the RF from the audio -so that the audio is left. To do that you'd use a discriminator, ratio detector or some other FM detector. You might then take the resulting audio to some tone decoder. You might also take a stereo signal and process it (demultiplexer?) so separate the channels. Extracting SCA off the top might be another process.
If your intent is to receive an FM signal then retransmit it to another receiver then you might need a Repeater or Transponder.
Just trying to help dig out what you are really after.