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Stacking of HifiBerry boards

I have read https://www.hifiberry.com/guides/gpio-usage-of-the-hifiberry-products/ but it is not clear to me if this means that you can never stack HiFiBerry modules on top of each other, because they use the same pins.

I would like to achieve a unit that can take both an analogue input over RCA and a digital S/PDIF and then I intend to use Liquidsoap to stream the inputs over my LAN. To do this, I would like to stack the DAC+ ADC and the DAC+ DSP. Is this impossible because of their shared pins, even if I would never use both digital and analogue inputs at the same time?

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