arduino - Convert PWM to Analog using a DAC chip in order to emulate a Potentiometer for audio

I'm trying to control audio level/gain (from line or amplified signal) using an Arduino. I do not want to use SPI, for this project I can only use the PWM outputs, thus I do not want to use a digital pot. I found some related questions here, but they do not fully explain how this approach applies to audio applications.

From the PWM I know I can use a low pass filter, but I want to save time and space using a DAC chip. One option is the TDA1543 (http://www.docethifi.com/TDA1543_.PDF).

So my questions are:

1. How do I connect the PWM and audio in/out using the DAC TDA1543?


2. Will this approach work as an audio pot controlled by PWM or is there a more straightforward option?

The TDA1543 has 8 pins:

1: bit clock input

2: word select input

3: data input

4: ground

5: voltage

6: left channel voltage output

7: reference voltage output

8: right channel output

Where do I connect the PWM, and audio in and out? I believe I also need to indicate the resistance somehow or add resistors such as in a 10K pot (amplified) or 100K pot (line).

Any help will be very much appreciated!!