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A set of quick google searches for "ros microphone array" and "ros multiple microphones" turns up:

https://github.com/introlab/introlab-ros-pkg/tree/master/manyears_ros
http://wiki.ros.org/roar
http://www.hark.jp/wiki.cgi?page=MainPage#p2

All of these look like they're doing custom audio capture using ALSA or another OS-level API.

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