Ask me how I know. However, others are more complex. Certain luxury cars in the late 1990s use a digital audio input over optic fibre that is difficult to spoof with off-the-shelf hardware.

For jobs like this, it’s tempting to just use an analog input on an Arduino and take care of conversions in code. But it’s nice to know how to do it old school, too, and hats off to [Kerry ...

Your analog music doesn't have to be limited to your Hi-Fi speakers. With a little effort you can match it up with your digital media setup.