Schematics pga2310

Hi,

Could you anyone explain me the use of the resistors in the red squares?

I’m a beginner in audio electronics and I need a little help .

Thanks
 

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Page 13 of the data sheet shows none of those parts are needed. When I designed CS3310 in a project last year,
I used 100 ohm resistors on the outputs and inputs though I did not use the caps on the input. IF I was using input
caps I would use bipolar caps because how do you know which way the DC (shouldn't be any) will be ? The resistors
on the outputs of most any opamp is to decouple capacitance from the amp to keep it stable. 27 to 100 ohms is
usually fine.