Well, it amazes me that so long after the first release I still have call to fix problems, no matter how small.
There are two files attached, add descr_strat to the appropriate folder only before starting a new campaign. This will change the rebel settlements in North America to Apache from Aztec.
Add the sound file to the main data folder at any time, then delete the two events files from the sound folder. (.idx and .dat) This will fix the arrow and musket firing sound issue as well as address some other similar bugs.