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No Bach in Sentry Mode

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I received the update yesterday, but the notes show only Dog Mode and Self-Folding Mirror option, no Sentry Mode. I can see the toggle switch on my phone app, and when I select it, the car display has a big red HAL eye, with the message that it is recording. However, no amount of arm-flapping and hovering will trigger an alarm.

BTW, I love the auto-activated mirror fold. It was one of my first "wish list" items!
 
Honestly, I would rather have the alarm goes off instead of playing BACH via speakers with highest volume. That may kill the speakers.
Someone on Reddit reached out to a Tesla/Model 3 Sound engineer and they confirmed that Sentry Mode would not damage the vehicle speakers.

Bach’s Toccata and Fugue in D Minor is a fitting ‘Sentry Tone.’

I would not worry about damage to the speakers. Even the subwoofer employs a high-pass filter to protect from the insanely low frequencies that Toccata and Fugue employs.

The systems group in Tesla have verified safe, distortion-free excursion in Sentry Mode. All of the speakers we provide undergo extended pink-noise power-testing that far exceeds’ music content.

In short, Sentry Mode is awesome and will not damage your stereo system.