Arkane's Deathloop has several puzzles and ways that you'll have to manipulate the titular loop on Blackreef island in order to hunt down and kill all eight Visionaries. One of these is the frequency control panel in Egor Serling's lab. Here's how to find it and shut it down.
Deathloop Egor control panel code guide
While hunting down visionary Egor Serling, you'll come to learn that he's become obsessed with a transmission on the island. To shut it down, you'll need to find a control panel that you're given a code and instructions for in Egor's lab.
Silencing Egor's device is the name of the game for this quest, and you can do it in the lab any time before Evening, but first you need that console. Go to the Complex at Noon and follow the marker to track down the console, which it turns out is invisible. To make it visible again, you'll need to return to Egor's lab.
Back at the lab, go to the second floor and use Shift to go through the window here. Shift won't trigger the sensors, so you can sneak in easy peasy. Check Egor's minicom to make sure you've listened to all of the messages on it, then check out the machinery in the room. Here you'll find a note called A Feature, Not a Bug that tells you you need a nullifier.
As luck would have it, there's a bunch of nullifiers right below the note you just found. Grab one and head back to the console marker. Set the nullifier down next to the marker, and turn it on to reveal the control panel.
Now that you've made the control panel visible, you can enter the code you got when we first started this whole rigmarole. Once you've done that, the device will shut down, killing the transmission Egor is so obsessed with.
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