USB audio on STM32L476RG

[Dodotronic]

Hi all
following the code example I'm trying to compile for STM32L476RG some of audio example but the device doesn't enumerate correctly.
Is there a complete example to follow as starting point?
I created a folder in which there are the following folders: class, common, device, osal, portable, typec and the files tusb.c tusb.h tusboption.h
Then under the main.c folder usb_descriptors.c and tusb_config.h
I changed the main.c according to the example