***IMPORTANT****
Back up the current "SweetFX" and "SweetFX_Resources" folders in \Steam\steamapps\common\CM2013\
in case you rather go back to the default v1.4 presets packaged with CM 2013
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Extract SweetFX into the following directory = \Steam\steamapps\common\CM2013\
Overwrite all files (updating v1.4 to v1.5.1)
Launch CM 2013 via "Start Menu" NOT STEAM or CM2013 won't work...