This comes through the audio out (speakers). There is a lower tone that appears when it writes to the screen (or receives data).FNSqueal.mp3Download MP3
Reminds me of the behavior of a VFD carrier frequency...
I wonder if it is a noise spike somehow getting multiplied by the baud rate...
I'm just ranting... WTF do I know? My grandson and I ran through the car wash with the back window raising and lowering by itself... what a rush!
Interesting stuff.
What do you think is causing it? Feedback of some sort?