How do I adjust the output level based on the external noise in the listening environment?

This will require a microphone somewhere in the system that will not be greatly influenced by the audio system. For example, you could have a microphone mounted near the engine to pick up engine noise.

Using the noise level of that microphone, you can apply a positive gain to audio signals in the SigmaDSP.

The attached project shows a basic example with the functionality of each cell labeled in a comment. For the purpose of this example, a white noise source is used in SigmaStudio. In a real project, this would instead be connected to an external microphone.

This project is intended as an example only and it was tested on the evaluation board. It has not been tested or tuned in a real audio system.

This question has been closed by the EZ team and is assumed answered.