NeetoRecord is designed to capture our thoughts, that is why if you turn off the audio, NeetoRecord will ask for a confirmation for no microphone every time you try to record a video.
Once you turned on the audio and selected an audio device.
Make sure you selected a valid working audio device. One way to make sure you have working audio is to check the Audio Analyser just below the microphone picker.
If you a have working audio, when we speak or make any sound we can see a visual representation of the audio in the Audio Analyser. If you don't see anything inside that means your audio device has some issue or you selected an invalid audio device.