My current project is an audio processing board

I use Wolfson WM8731 audio codec to sample the audio signal. The data is transferred to the ST STM32F405 microcontroller. For high performance, DMA?transfer is configured. The audio data can now be processed using FIR filter algorithms etc. After that, the microcontroller transfers the data back to the audio codec which converts the data back to an audio signal. The following figure shows how it works:

In addition, a microSD?Slot is provided to store data or to read configurations from files. The circuit and software already works on a breadboard.