What is the square IC (AKK) on ESP Muse Proto?

Hi, just got the ESP Muse Proto up and running - works great!

I think I have identified most of the components and understand their use, but what is the square IC to the left of the raspiaudi text and what is it used for? Text is tiny, but I think it says “AKK 71R”.
ic

Thanks
Per Thomas

THis is the 3w amp + DAC

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