This may or may not be a transition into a WILD. It depends on whether or not you are dreaming when you can't hear the audio.

You can do a reality check to determine if you transitioned into a dream upon not being able to hear the audio. However, this requires self-awareness, not mindlessness.

Mindlessness does not equal lucidity. The lucid mindset comes when you realize what you are experiencing is coming from you. When you are mindless, you are not in this mindset.