Hi Colla many thanks for your support.
I followed exactly the steps from your tutorial.
Code, libraries and sound example untouched and out of your repository:
I rebuilt my RAK 18060 Audio Amplifier (E469747 Version A) back to be powered over the local battery and not over external battery. So everything is out of the box.
The music plays, but the command on line 102
rak_audio.setVolume(6); //The volume level can be set to 0-21
has absolutely no influence to the output volume, no matter what you set, the audio level is always on the maximum.
By compilation i get some warnings about deprication, but build and upload works fine.
I2S_COMM_FORMAT_PCM attribute((deprecated)) = 0x04, /!< I2S communication format PCM, correspond to
The audio library is latest version out of your GitHub repository.
Many thanks for your support, i run a little out of ideas and options.
Best regards Peter Kuemmerli