Apparently it's all the same hardware and the only difference is the firmware.

I think I found the correct firmware file and put it here.

And regarding "line in mode":

Quote:
The microphone gain can be changed from -3dB to 42dB in linear steps. If the gain is set to less than 24dB using the ‘SM’ command the line in mode is automatically entered.


That eval kit is tempting, considering it's only $35 more than the Sparkfun breakout board and it would save a lot of soldering and figuring how to mount everything securely
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~ John