Screen dims then beeps once per minute while charging

I'm experiencing an issue where exactly every 60 seconds, the screen briefly dims, then brightens, then beeps. I don't care about the dimming/brightening, but the beeping is maddening. It happens while charging using a new (non-Apple) Magsafe3 connector I bought, connected to a 96W Apple power adaptor. This combo otherwise seems to charge fine. So: can I fix this behaviour? Or at the least, prevent the beeping? It's a 2022 M2 Max Macbook Pro. Ventura 13.6.3 (22G436) EDIT After some research I've discovered: - the screen dimming behaviour can be disabled in settings, "Slightly dim the display on battery" - the beep is called the "Power chime". So now the question is how to disable the power chime. The actual file is at /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif but I'm not able to modify/remove it.