yep, noticed that after reading more and observing the time frame of the graph over months. Only when condensed do the waves appear as sound. Perhaps it is the speaking of Angels one to another?
Even after reading that I still have trouble digesting that the sound is accurately depicted.
Record yourself and play the recording back at the same playback rate as the NASA video and you’ll see what I mean.
That isn't the only 'song' voyager has made (not just another one hit wonder)
I think you will enjoy this.