dac+ adc GPIO layout /balanced in/out

hey! just got my dac+adc today, first of all id like to say that im super impressed, using it for real time audio, doing pretty heavy processing and i can go down to about 4ms roundtrip latency at 96000 with no dropouts! kudus for that!!
i have two questions: first, is it possible to find the pin layout somewhere? i need to add some switches to my pi so id like to know which are available, and second id like to add balanced inputs and outputs, i might confuse stuff but do i need to add a negative -5v rail?



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