First, add agenerator like Sytrus or Harmor to the Channel rack.
Note: You must have FL Studio Producer Edition or higher torecord audio and vocals. Then, how do I record audio in FL Studio? An audio source must be connected to your audiodevice audio input/s (DOH!). Enable microphone access for FL Studio.The recording filter (shown above) must be set torecord audio (Right-Click the record button ), ifyou are recording to disk (Playlist recording). You must be using FL Studio ProducerEdition or higher.