Why does the GeekPort have 4 DACs but only 1 ADC?

The BeBox
Specifications

On the GeekPort, there are four DACs (one for each output) but one ADC for all the four inputs. How can this work?

The BeBox:
Specifications

FAQ Number:
FAQ-0057

Last Modified:
2/3/98

Keywords:
BeOS, BeBox, Specifications, GeekPort, DAC, ADC

There is a multiplexer that is used to select which of the 4 pins to sample.

What is the GeekPort sample rate?

Why is it called the "GeekPort?"

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Why does the GeekPort have 4 DACs but only 1 ADC?

On the GeekPort, there are four DACs (one for each output) but one ADC for all the four inputs. How can this work?