Truly incredible work. The multitrack visualization is a really great UI, and it does wonders communicating just how much teamwork went into managing these missions. I had no idea all the mission control workstations were recorded, and how active they all were even when the crew was doing an unrelated task.
Some small thoughts: when a desk is selected it would be great to deselect it by clicking it again to go back to the master audio. And it would also be great to have the selected button highlight when signal is/isn’t present - perhaps a lighter blue color? That way a user can build an intuition about what a lit button/region that they’re not listening to means.
Oh, and it would be fascinating to see a statistical comparison of channel activity in Apollo 11 vs. 13 :)
Honestly this is mind blowing. Your site deserves national attention, display on major news networks, millions reliving the behind-the-scenes teamwork that led to IMO the greatest human accomplishment in history. Huge kudos.