Direct MP3/WAV/OGG URLs supported. YouTube requires prior conversion.
Select a range from 1 to 10 seconds by dragging the waveform.
Tesla default lock sound is around −6 dB. Normal is recommended.
Format a USB flash drive as FAT32.
Rename your audio to LockChime.wav and place it in the root of the USB drive (not inside any folder).
LockChime.wav
Connect USB to your Tesla, then go to Toybox → Boombox → Lock Sound and select your custom sound.
The selected range exceeds 1 MB even at the lowest quality. Please shorten the selection (max 3 seconds recommended).