Minute Background Sound During Trump’s News Conference.

While I was driving around in my car, I was listening to Sirius XM channel, CNBC and it just so happened that President Trump was giving a news conference live January 4, 2019. What was odd was in the background audio was the faint sound of a baby rattle or rattle snake rattle which would come and go at regular intervals. I have never heard this sound before and thought it might be the audio person adding the minute sound effect to convey a message. When I heard this background sound, I took it to mean what comes from thinking about the sources I listed.