# The audio passthrough project

A "passthrough" can be viewed as the audio processing equivalent of a "hello world" program. In this section we will program the Nucleo to simply pass the audio samples from the microphone to the DAC.

Using the CubeMX software, we will first [update the configuration of the microcontroller](https://hwlab.learndsp.org/audio-peripherals/passthrough/io_setup). We will then guide you through the [wiring ](https://hwlab.learndsp.org/audio-peripherals/passthrough/wiring)and, finally, we will [program our passthrough](https://hwlab.learndsp.org/audio-peripherals/passthrough/coding) using the SW4STM32 software.

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{% hint style="info" %}
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{% endhint %}

A passthrough is a great *sanity check* when first beginning with an audio DSP system. Moreover, it serves as a useful starting point for new projects, as we will see in the following chapters when we develop more complicated programs.

![Figure: Final wiring.](https://1958907383-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lu3g0bb8nPq-K9HlS53%2F-Lu3gKRWqzqKeboGKYkt%2F-Lu3gLtBwmeroTeEtyPB%2Ffinal_wiring.jpg?generation=1574184252145390\&alt=media)


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