All radio functions work but there is no noise coming out of speakers. l already checked the mute button. Volume knob is operational but no sound.

1.) operator error
2.) bad fuse
3.) bad button/knob
4,) blown operational amp inside radio
5.) speekers missing
6.) operators' hearing aid requires service/ or requires a hearing aid

Volume control is a variable resistor electronic component called pots.Have your Porsche dealer checked it for you , it should be still under warranty.