I am using a 32bit DShot1200 ESC, how can I make a custom startup sound for when the drone is powered on?
First, remove your props, plug your quad into the computer and plug in a battery.
You then need to go into BLHeli Suite 32 and read your ESC setup.
You will then have options to sync ESC music and you can upload your tones.
A more detailed guide with lots of detail for each step can be found here: https://oscarliang.com/blheli-32-custom-startup-tone-music/