## Wat

This pcb is an audio multiplexer, meaning it can switch three analog inputs into one analog output. 

## Why

Sometimes you just need more inputs. And this is how you do it.

## How

The BD3491 does all the audio switching. It combines one 6 input switch and an equalizer into a simple package. 
The STM32 configures the BD3491 to switch to the specified inputs based on pressed buttons or software control.