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/usr/lib/pd/extra/mapping/README.txt is in pd-mapping 0.2.1-1.

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This is the beginnings of the "mapping" library, which is a combination of
efforts of Cyrille Henry and Hans-Christoph Steiner.  It draws from the hid_*
classes, ds_/datastream classes, and the La-Kitchen classes for working with
sensors.

These classes are for creatively mapping data to something that you want to
control.