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the ability to synchronize multiple channels of two boards?

I am currently working on a project that synchronously plays (transmit) and records (receive) on multiple channels of audio (currently two). The system would eventually require two DAC+ADC boards, giving us 4 channels in total. I currently have one Raspberry Pi setup with a DAC+ADC board. I am wondering if it is possible to have both boards connected to one or two Raspberry Pis while keeping the DAC and ADC clock synchronized.

Right now we would like to play the same sound out of all transmit channels simultaneously; record the input of all the receive channels simultaneously. 

If not, can you provide any recommendations of any system that allows us to achieve this? Thank you in advance.

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