Clicking sound made by turning lights

I want to modify the sound made (inside the car) when using the turning lights, more precisely making the sound louder.
Most people think the sound is made by a relay somewhere in the dash, this isn't true in my Aveo (T300).
The clicking sound comes from the speaker in the drivers door and is made digital.
The lights themselves are commanded by the BCM (Body Control Module) named GM13504847.
I suppose there is a hidden menu where the loudness can be adjusted.
Can somebody confirm this?