A custom connector would be required between this D-shape rows of pins port and a standard input socket for phono/rca or 3.5inch or 1/4inch jack.
What would be the bit depth and sampling rate?
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No, it can not be used to sample audio.
As the link you provided says, in 12-bit mode it takes 10 milliseconds to convert a sample, and even in 8-bit mode it takes 4 milliseconds.
That results into maximum sampling rate of 250 Hz, which is useless for sampling audio.
The low sampling rate indicates the analog input is meant for slowly changing signals, like sampling a paddle position, and it can be used for datalogging something that changes slowly enough like temperature.