Hi, Sam-
You input a non-bandpassed time series to 3dRSFC, and you can get out:
+ voxelwise map of ALFF (single value per voxel), which contains the sum of LFF amplitudes.
+ voxelwise map of fALFF (single value per voxel), which contains the ratio of LFF amplitudes to the full time series' amplitudes.
+ and similarly maps of RSFA and fRSFA, as well as a couple other related parameters.
The LFF range is defined by user, and during that process, the time series are bandpassed, and so one can also output the bandpassed time series, if that is of interest.
--pt